WO2013039179A1 - 位相差フィルム、並びにこれを用いた円偏光板及び画像表示装置 - Google Patents
位相差フィルム、並びにこれを用いた円偏光板及び画像表示装置 Download PDFInfo
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- WO2013039179A1 WO2013039179A1 PCT/JP2012/073528 JP2012073528W WO2013039179A1 WO 2013039179 A1 WO2013039179 A1 WO 2013039179A1 JP 2012073528 W JP2012073528 W JP 2012073528W WO 2013039179 A1 WO2013039179 A1 WO 2013039179A1
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- WIPO (PCT)
- Prior art keywords
- film
- retardation film
- formula
- structural unit
- dihydroxy compound
- Prior art date
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- 125000004036 acetal group Chemical group 0.000 description 4
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- 125000003545 alkoxy group Chemical group 0.000 description 4
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- 230000000052 comparative effect Effects 0.000 description 4
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- 238000005260 corrosion Methods 0.000 description 4
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- 238000013461 design Methods 0.000 description 4
- 150000001991 dicarboxylic acids Chemical class 0.000 description 4
- ROORDVPLFPIABK-UHFFFAOYSA-N diphenyl carbonate Chemical compound C=1C=CC=CC=1OC(=O)OC1=CC=CC=C1 ROORDVPLFPIABK-UHFFFAOYSA-N 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 125000001301 ethoxy group Chemical group [H]C([H])([H])C([H])([H])O* 0.000 description 4
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- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 4
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 4
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- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 3
- VPWNQTHUCYMVMZ-UHFFFAOYSA-N 4,4'-sulfonyldiphenol Chemical class C1=CC(O)=CC=C1S(=O)(=O)C1=CC=C(O)C=C1 VPWNQTHUCYMVMZ-UHFFFAOYSA-N 0.000 description 3
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- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
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- 229910052698 phosphorus Inorganic materials 0.000 description 3
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- WGKLOLBTFWFKOD-UHFFFAOYSA-N tris(2-nonylphenyl) phosphite Chemical compound CCCCCCCCCC1=CC=CC=C1OP(OC=1C(=CC=CC=1)CCCCCCCCC)OC1=CC=CC=C1CCCCCCCCC WGKLOLBTFWFKOD-UHFFFAOYSA-N 0.000 description 1
- QQBLOZGVRHAYGT-UHFFFAOYSA-N tris-decyl phosphite Chemical compound CCCCCCCCCCOP(OCCCCCCCCCC)OCCCCCCCCCC QQBLOZGVRHAYGT-UHFFFAOYSA-N 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
- 150000003755 zirconium compounds Chemical class 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G64/00—Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule
- C08G64/16—Aliphatic-aromatic or araliphatic polycarbonates
- C08G64/1608—Aliphatic-aromatic or araliphatic polycarbonates saturated
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/08—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of polarising materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G64/00—Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule
- C08G64/18—Block or graft polymers
- C08G64/183—Block or graft polymers containing polyether sequences
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B11/00—Making preforms
- B29B11/06—Making preforms by moulding the material
- B29B11/10—Extrusion moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/005—Shaping by stretching, e.g. drawing through a die; Apparatus therefor characterised by the choice of materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00634—Production of filters
- B29D11/00644—Production of filters polarizing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2069/00—Use of PC, i.e. polycarbonates or derivatives thereof, as moulding material
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G64/00—Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule
- C08G64/20—General preparatory processes
- C08G64/30—General preparatory processes using carbonates
- C08G64/305—General preparatory processes using carbonates and alcohols
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2369/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/22—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
Definitions
- the present invention provides a retardation film that is less likely to cause color loss and color shift even under severe conditions of temperature and humidity, and that can be manufactured by a melt film forming method, and a circularly polarized light using the retardation film.
- the present invention relates to a plate and an image display device.
- a retardation film that exhibits reverse wavelength dispersion that becomes smaller as the retardation becomes shorter can obtain ideal retardation characteristics at each wavelength in the visible region. Useful for prevention.
- As the retardation film having such performance 9,9-bis [4- (2-hydroxyethoxy) phenyl] fluorene and 9,9-bis (4-hydroxy-3-methylphenyl) fluorene are used as raw materials.
- a retardation film made of a polycarbonate resin is disclosed (for example, see Patent Document 1).
- the polycarbonate resin described in Patent Document 1 has a high glass transition temperature, and it is difficult to form a film by a melt film forming method, and a raw film (film before stretching treatment) is formed by a solution casting method. Yes.
- the solution casting method literally requires the use of a solvent and has a large impact on the environment.Therefore, not only is improvement required, but the residual solvent in the product retardation film acts like a plasticizer, and the temperature Due to changes in the external environment such as humidity and humidity, the optical characteristics change, which causes a problem of color loss and color shift.
- the solvent used for solution casting is often a chlorinated solvent such as dichloromethane from the viewpoint of solubility, volatility, and nonflammability, which causes equipment corrosion when processed into a retardation film.
- a chlorinated solvent such as dichloromethane from the viewpoint of solubility, volatility, and nonflammability, which causes equipment corrosion when processed into a retardation film.
- other components are adversely affected when assembled in an image display device.
- the raw film obtained from the polycarbonate resin disclosed in Patent Document 1 is very brittle, there is also a problem that it is inferior in workability such as causing breakage during stretching.
- Films made of terpolymer polycarbonate resins made from isosorbide, biscresol fluorene, aliphatic diols, alicyclic diols, spiroglycols, etc. are used as the resins capable of melt-forming the raw film. It is disclosed (see Patent Document 2). Also, 9,9-bis [4- (2-hydroxyethoxy) phenyl] fluorene or 9,9-bis (4-hydroxy-3-methylphenyl) fluorene and an alicyclic diol having 4 to 20 carbon atoms or hetero A film made of a binary copolymer polycarbonate resin with an atom-containing cyclic dihydroxy compound is disclosed (see Patent Document 3).
- the original film of the retardation film having the reverse wavelength dispersion characteristic used for various image display devices and mobile devices which are rapidly expanding in recent years is improved in retardation distribution and thickness unevenness, and reduced environmental load. Therefore, it is strongly desired to form by a melt film forming method that does not use a solvent.
- the retardation film used in such a field may be used under various temperature and humidity conditions unlike a normal application, its optical characteristic change may be small due to environmental changes during use. In particular, there has been a demand for suppressing deterioration in image quality such as color loss and color shift of images during long-term use.
- organic EL displays which are currently in the spotlight as next-generation image display devices, basically require a reflective layer inside the display, which will further improve the anti-reflection performance and severe environmental changes. There has been a strong demand for stabilization of optical properties that are not affected.
- the gist of the present invention is the following [1] to [13].
- R 1 (450) and R 1 (550) represent retardation values in the film plane at wavelengths of 450 nm and 550 nm, respectively, and R 2 (450) and R 2 (550) are respectively at a temperature of 90 ° C. Represents the retardation value in the film plane at wavelengths of 450 nm and 550 nm after standing for 48 hours.
- the polymer is a polycarbonate resin
- the structural unit (b) is a structural unit derived from a dihydroxy compound represented by the following formula (1)
- the structural unit (a) is represented by the following formula: Structural unit derived from dihydroxy compound represented by (2), dihydroxy compound represented by formula (3) below, dihydroxy compound represented by formula (4) below, dihydroxy compound represented by formula (5) below
- the retardation film according to [4] which is a structural unit derived from one or more dihydroxy compounds selected from the group consisting of dihydroxy compounds represented by the following formula (6).
- R 1 to R 4 are each independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted carbon group having 6 to 20 carbon atoms, Represents a cycloalkyl group or a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, and the same or different groups are arranged as each of the four substituents on each benzene ring.
- X 1 and X 2 are each independently a substituted or unsubstituted alkylene group having 2 to 10 carbon atoms, a substituted or unsubstituted cycloalkylene group having 6 to 20 carbon atoms, or a substituted or unsubstituted carbon.
- R 5 represents a substituted or unsubstituted cycloalkylene group having 4 to 20 carbon atoms.
- HO—CH 2 —R 6 —CH 2 —OH (4) represents a substituted or unsubstituted cycloalkylene group having 4 to 20 carbon atoms.
- H— (O—R 7 ) p —OH (5) In the above formula (5), R 7 represents a substituted or unsubstituted alkylene group having 2 to 10 carbon atoms, and p is an integer of 2 to 50.
- HO—R 8 —OH (6) In the above formula (6), R 8 represents a substituted or unsubstituted alkylene group having 2 to 20 carbon atoms or a group represented by the following formula (6A).
- the structural unit (b) is a structural unit derived from the dihydroxy compound represented by the formula (1), and the structural unit (a) is a dihydroxy compound represented by the formula (2).
- a circularly polarizing plate constituted by laminating the retardation film according to any one of [1] to [10] and a polarizing plate.
- the retardation film of the present invention has a low environmental impact, can be formed by an economical melt film forming method, and can be used for color loss and color shift even after long-term use under high temperature and high humidity conditions. Therefore, the retardation film of the present invention and the circularly polarizing plate and the image display device using the retardation film of the present invention are, for example, an optical compensation film for a display for an in-vehicle device or an organic EL. It can be suitably used for a quarter- ⁇ plate for a circularly polarizing plate for preventing reflection.
- the retardation film of the present invention satisfies the relationship of the following formulas (A) and (B), preferably further satisfies the relationship of the following formulas (C) and (D), and is preferably a single layer film (1 Sheet of the film) satisfies the relationship of the following formulas (A) and (B), and preferably further satisfies the relationship of the following formulas (C) and (D). Since the thickness of the retardation film made of a laminated film increases, the retardation film of the present invention is preferably made of a single layer film.
- R 1 (450) and R 1 (550) represent retardation values in the film plane at wavelengths of 450 nm and 550 nm, respectively, and R 2 (450) and R 2 (550) are respectively at a temperature of 90 ° C. Represents the retardation value in the film plane at wavelengths of 450 nm and 550 nm after standing for 48 hours.
- the retardation value in the film plane at the measurement wavelength of 550 nm of the retardation film of the present invention is usually from 100 nm to 180 nm, preferably from 120 nm to 170 nm, particularly preferably from 135 nm to 155 nm, and is described in the Examples section below. It is measured by the method.
- R 1 (450) / R 1 (550) is preferably 0.70 or more and 0.99 or less, more preferably 0.75 or more and 0.97 or less, More preferably, it is 0.75 or more and 0.95 or less, particularly preferably 0.86 or more and 0.93 or less, and most preferably 0.88 or more and 0.91 or less.
- R 1 (450) / R 1 (550) If the value of R 1 (450) / R 1 (550) is in the above range, the longer the wavelength, the more the phase difference is expressed, and an ideal phase difference characteristic can be obtained at each wavelength in the visible region.
- a circularly polarizing plate or the like can be produced by laminating the retardation film of the present invention having such wavelength dependency as a 1 ⁇ 4 ⁇ plate with a polarizing plate, and has an external light antireflection function at any wavelength. It is possible to realize a circularly polarizing plate and an image display device excellent in blackness.
- the value of R 1 (450) / R 1 (550) when the value of R 1 (450) / R 1 (550) is out of the above range, the color loss due to the wavelength becomes large, and coloring problems occur in the circularly polarizing plate and the image display device.
- the retardation film of the present invention satisfies the relationship of the above formula (B), and
- is preferably greater than 0 and 0.018 or less, and greater than 0. More preferably, it is 0.015 or less. Furthermore, it is preferably greater than 0 and 0.010 or less.
- the retardation film of the present invention preferably satisfies the relationship of the above formula (C), and R 1 (650) / R 1 (550) is preferably larger than 1 and smaller than 1.2.
- R 1 (650) / R 1 (550) is more preferably from 1.00 to 1.20, more preferably from 1.00 to 1.10, More preferably, it is 1.00 or more and 1.05 or less, and particularly preferably 1.00 or more and 1.035 or less.
- a circularly polarizing plate or the like can be produced by laminating the retardation film of the present invention having such wavelength dependency as a 1 ⁇ 4 ⁇ plate with a polarizing plate, and has an external light antireflection function at any wavelength. It is possible to realize a circularly polarizing plate and an image display device excellent in blackness.
- the relationship of the formula (A) is satisfied, if the value of R 1 (650) / R 1 (550) is out of the above range, color loss or the like may occur.
- the retardation film of the present invention satisfies the relationship of the above formula (D), and
- (ie, R 2 (650 ) / R 2 (550) and R 1 (650) / R 1 (550) is preferably less than 0.010, more preferably 0.008 or less, and 0.0075 or less. It is particularly preferred that
- the retardation film of the present invention is characterized in that the original film can be formed into a melt, and its optical property change is small even when the environment changes during use. It is important to control the glass transition temperature of the polymer constituting the.
- the lower limit of the glass transition temperature of the polymer used in the retardation film of the present invention is preferably 110 ° C. or higher, more preferably 120 ° C. or higher, still more preferably 125 ° C. or higher, particularly preferably 130 ° C. or higher, particularly 140 ° C. or higher. Is the best. If the glass transition temperature is excessively low, the heat resistance tends to deteriorate, and the optical properties may change at high temperatures or high humidity. On the other hand, an upper limit becomes like this. Preferably it is 180 degrees C or less, More preferably, it is 160 degrees C or less, More preferably, it is 150 degrees C or less.
- the film forming temperature of the original fabric and the temperature during stretching must be increased, leading to a decrease in the molecular weight of the polymer, a deterioration such as coloring, and a film defect due to gas generation. Sometimes. Furthermore, it becomes difficult to obtain a film having a uniform thickness, and spots may appear in the expression of the phase difference.
- the method for measuring the glass transition temperature of the present invention is described in the Examples section.
- the thickness of the optical film of the present invention is usually preferably 150 ⁇ m or less, more preferably 100 ⁇ m or less, and more preferably 60 ⁇ m or less. If the thickness of the retardation film is excessively large, more film-forming materials are required to produce a film of the same area, which may be inefficient, and the thickness of the product using the film may increase. In addition, it may be difficult to control uniformity, and may not be compatible with equipment that requires precision, thinness, and uniformity.
- the lower limit of the thickness of the retardation film of the present invention is preferably 5 ⁇ m or more, more preferably 10 ⁇ m or more. If the thickness of the retardation film is excessively thin, handling of the film becomes difficult, wrinkles may occur during production, and it may be difficult to bond with other films such as protective films or sheets.
- the retardation film of the present invention preferably has an internal haze of 3% or less, and more preferably 1.5% or less.
- the lower limit of the internal haze is not particularly defined, but is usually 0.2% or more.
- the internal haze of the optical film is measured at 23 ° C. using, for example, a haze meter (“HM-150” manufactured by Murakami Color Research Laboratory Co., Ltd.). The measurement sample was prepared by using a transparent film with a pressure-sensitive adhesive that had been measured in advance, pasted on both sides of the sample film, and removing the influence of external haze. The difference in the haze value of the attached transparent film is used.
- the retardation film of the present invention preferably has a b * value of 3 or less. If the b * value of the retardation film is too large, problems such as coloring may occur.
- the b * value of the retardation film of the present invention is more preferably 2 or less, and particularly preferably 1 or less.
- the b * value of the retardation film is measured with light having a wavelength of 550 nm at 23 ° C. using, for example, a spectrophotometer (“DOT-3” manufactured by Murakami Color Research Laboratory Co., Ltd.).
- the retardation film of the present invention preferably has a total light transmittance of 80% or more, and more preferably 90% or more, regardless of the thickness. If the transmittance is equal to or higher than the above lower limit, a retardation film with little coloring is obtained, and when it is bonded to a polarizing plate, it becomes a circularly polarizing plate having a high degree of polarization and transmittance, and is high when used in an image display device. Display quality can be realized.
- the upper limit of the total light transmittance of the retardation film of the present invention is not particularly limited but is usually 99% or less.
- the retardation film of the present invention preferably has a refractive index of 1.57 to 1.62 at the sodium d line (589 nm). If this refractive index is less than 1.57, birefringence may be too small. On the other hand, when the refractive index exceeds 1.62, the reflectance increases and the light transmittance may decrease.
- the retardation film of the present invention preferably has a birefringence of 0.001 or more.
- a higher birefringence is preferable.
- the birefringence is particularly preferably 0.0015 or more, and most preferably 0.002 or more. If the birefringence is less than 0.001, it is necessary to increase the thickness of the film excessively, which increases the amount of film-forming material used, making it difficult to control homogeneity in terms of thickness, transparency, and phase difference. It becomes.
- birefringence when the birefringence is less than 0.001, there is a possibility that it cannot be adapted to a device that requires precision, thinness, and homogeneity.
- the upper limit of birefringence is not particularly limited, but in order to increase the birefringence, excessively lowering the stretching temperature or excessively increasing the stretching ratio may cause breakage during stretching or non-uniformity of the stretched film. Therefore, it is usually 0.007 or less.
- the retardation film of the present invention preferably has a water absorption rate of greater than 1.0% by weight. If the water absorption is larger than 1.0% by weight, the adhesiveness can be easily secured when the retardation film is bonded to another film. For example, since the retardation film is hydrophilic when bonded to a polarizing plate, the contact angle of water is low, the adhesive can be easily designed, and a high adhesion design can be achieved. When the water absorption is 1.0% by weight or less, it becomes hydrophobic and the contact angle of water is high, making it difficult to design adhesiveness.
- the retardation film of the present invention preferably has a water absorption rate of more than 1.0% by weight and 2.0% by weight or less, more preferably 1.1% by weight or more and 1.5% by weight or less.
- the method for producing the retardation film of the present invention that satisfies the above conditions is not particularly limited as long as it is a method capable of producing a retardation film that satisfies the above conditions.
- the position of the present invention is improved.
- a phase difference film can be produced.
- the copolymer composition ratio of the polymer used as the film forming material of the retardation film is adjusted.
- a resin composition containing a compound having a reactive functional group is used as a film forming material for the retardation film.
- the polymer (hereinafter sometimes referred to as “polymer of the present invention”) has a structural unit (a) having a positive refractive index anisotropy having an absorption edge of less than 260 nm, and an absorption edge of 260 to 380 nm. And a structural unit (b) having a certain negative refractive index anisotropy.
- the absorption edge is 2 nm from 190 nm to 500 nm using a UV-visible spectrophotometer “V-570” (manufactured by JASCO Corporation) by producing a homopolymer of each structural unit and using a heat-press molding film.
- the transmittance was measured for each.
- the wavelength at which the transmittance became 0 or less was defined as the absorption edge.
- the hot press molding was performed by sandwiching between polyimide films using an aluminum spacer having a thickness of 100 ⁇ m. The press temperature and the press pressure were appropriately set so that the thickness of the obtained film was 150 ⁇ m ⁇ 30 ⁇ m.
- the refractive index anisotropy was measured by producing a homopolymer of each structural unit, and the homopolymer glass transition temperature + 20 ° C. with respect to the film produced under the same conditions as those produced in the measurement of the absorption edge described above.
- the film was stretched uniaxially and uniaxially at a free end under the conditions of 2 and the refractive index of the obtained stretched film was measured with an Abbe refractometer “DR-4” (manufactured by Atago Co., Ltd.).
- the polymer of the present invention may contain only one type of the above structural unit (a) or may contain two or more types of structural unit (a). Also, the structural unit (b) may contain only one type, or may contain two or more types.
- the polymer of the present invention is not particularly limited, but is preferably a polycarbonate resin and / or a polyester carbonate resin from the viewpoint of heat resistance and ease of copolymerization.
- the polymer of the present invention is a polycarbonate resin (hereinafter sometimes referred to as “the polycarbonate resin of the present invention”) will be described as an example of the structural unit. It is not limited to polycarbonate resin at all.
- R 5 represents a substituted or unsubstituted cycloalkylene group having 4 to 20 carbon atoms.
- R 6 represents a substituted or unsubstituted cycloalkylene group having 4 to 20 carbon atoms.
- R 7 represents a substituted or unsubstituted alkylene group having 2 to 10 carbon atoms, and p is an integer of 2 to 50.
- R 8 represents a substituted or unsubstituted alkylene group having 2 to 20 carbon atoms or a group represented by the following formula (6A).
- the carbon number of various groups means the total carbon number including the carbon number of the substituent, when the said group has a substituent.
- dihydroxy compound represented by Formula (2) examples include isosorbide, isomannide, and isoide which are in a stereoisomeric relationship. These may be used individually by 1 type and may be used in combination of 2 or more type. Among these dihydroxy compounds, isosorbide obtained by dehydrating condensation of sorbitol produced from various starches that are abundant as resources and are readily available is easy to obtain and manufacture, optical properties, moldability From the viewpoint of the above, it is most preferable.
- the dihydroxy compound represented by the formula (3) is an alicyclic dihydroxy compound having a substituted or unsubstituted cycloalkylene group having 4 to 20 carbon atoms, preferably 4 to 18 carbon atoms, in R 5. is there.
- R 5 has a substituent
- examples of the substituent include a substituted or unsubstituted alkyl group having 1 to 12 carbon atoms.
- the alkyl group has a substituent
- the substituent Examples thereof include alkoxy groups such as methoxy group, ethoxy group, and propoxy group, and aryl groups such as phenyl group and naphthyl group.
- This dihydroxy compound has a ring structure, whereby it is possible to increase the toughness of a molded product when the obtained polycarbonate resin is molded, and in particular, the toughness when molded into a film can be increased.
- the cycloalkylene group for R 5 is not particularly limited as long as it is a hydrocarbon group having a ring structure, and may be a bridge structure having a bridgehead carbon atom.
- the dihydroxy compound represented by the formula (3) is a compound having a 5-membered ring structure or a 6-membered ring structure, that is, R 5 is A dihydroxy compound which is a substituted or unsubstituted cyclopentylene group or a substituted or unsubstituted cyclohexylene group is preferred.
- the heat resistance of the polycarbonate resin obtained can be made high by including a 5-membered ring structure or a 6-membered ring structure.
- the 6-membered ring structure may be fixed in a chair shape or a boat shape by a covalent bond.
- the dihydroxy compound represented by formula (3) preferably R 5 is various isomers represented by the following formula (7).
- R 11 represents a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 12 carbon atoms.
- substituent include alkoxy groups such as a methoxy group, an ethoxy group, and a propoxy group, and aryl groups such as a phenyl group and a naphthyl group Is mentioned.
- dihydroxy compound represented by the formula (3) tetramethylcyclobutanediol, 1,2-cyclopentanediol, 1,3-cyclopentanediol, 1,2-cyclohexanediol, 1,3 -Cyclohexanediol, 1,4-cyclohexanediol, 2-methyl-1,4-cyclohexanediol, tricyclodecanediols, pentacyclodiols and the like are exemplified, but not limited thereto. These may be used alone or in combination of two or more.
- the dihydroxy compound represented by the formula (4) is an alicyclic dihydroxy compound having a substituted or unsubstituted cycloalkylene group having 4 to 20 carbon atoms, preferably 3 to 18 carbon atoms, in R 6. is there.
- R 6 has a substituent
- examples of the substituent include a substituted or unsubstituted alkyl group having 1 to 12 carbon atoms.
- the alkyl group has a substituent
- the substituent Examples thereof include alkoxy groups such as methoxy group, ethoxy group, and propoxy group, and aryl groups such as phenyl group and naphthyl group.
- This dihydroxy compound has a ring structure, whereby it is possible to increase the toughness of a molded product when the obtained polycarbonate resin is molded, and in particular, the toughness when molded into a film can be increased.
- the cycloalkylene group for R 6 is not particularly limited as long as it is a hydrocarbon group having a ring structure, and may be a bridge structure having a bridgehead carbon atom.
- the dihydroxy compound represented by the formula (4) is a compound containing a 5-membered ring structure or a 6-membered ring structure, that is, R 6 is A dihydroxy compound which is a substituted or unsubstituted cyclopentylene group or a substituted or unsubstituted cyclohexylene group is preferred.
- the heat resistance of the polycarbonate resin obtained can be made high by including a 5-membered ring structure or a 6-membered ring structure.
- the 6-membered ring structure may be fixed in a chair shape or a boat shape by a covalent bond.
- R 6 is various isomers represented by the formula (7).
- dihydroxy compound represented by the formula (4) 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, 3,8-bis (hydroxy) Methyl) tricyclo [5.2.1.0 2.6 ] decane, 3,9-bis (hydroxymethyl) tricyclo [5.2.1.0 2.6 ] decane, 4,8-bis (hydroxymethyl) Tricyclo [5.2.1.0 2.6 ] decane, 4,9-bis (hydroxymethyl) tricyclo [5.2.1.0 2.6 ] decane, 8-hydroxy-3-hydroxymethyltricyclo [ 5.2.1.0 2.6] decane, 9-hydroxy-3-hydroxymethyl-tricyclo [5.2.1.0 2.6] decane, 8-hydroxy-4-hydroxymethyl Tricyclo [5.2.1.0 2.6] decane, 9-hydroxy-4-hydroxymethyl-tricyclo [5.2.1.0 2.6] Although decane and the like, as being limited to these It is not a thing.
- these dihydroxy compounds may be used alone or in combination of two or more. That is, although these dihydroxy compounds may be obtained as a mixture of isomers for production reasons, they can be used as they are as an isomer mixture.
- 3,8-bis (hydroxymethyl) tricyclo [5.2.1.0 2.6 ] decane, 3,9-bis (hydroxymethyl) tricyclo [5.2.1.0 2.6 ] decane, 4,8-bis (hydroxymethyl) tricyclo [5.2.1.0 2.6 ] decane and a mixture of 4,9-bis (hydroxymethyl) tricyclo [5.2.1.0 2.6 ] decane Can be used.
- cyclohexanedimethanols are particularly preferable. From the viewpoint of easy availability and easy handling, 1,4-cyclohexanedimethanol, 1 1,3-cyclohexanedimethanol and 1,2-cyclohexanedimethanol are preferable, and 1,4-cyclohexanedimethanol is particularly preferable because it has a great effect of imparting toughness.
- the dihydroxy compound represented by the formula (5) is a compound having a substituted or unsubstituted alkylene group having 2 to 10 carbon atoms, preferably 2 to 5 carbon atoms, in R 7 .
- p is an integer of 2 to 50, preferably 2 to 30.
- Examples of the dihydroxy compound represented by the formula (5) include diethylene glycol, triethylene glycol, polyethylene glycol, dipropylene glycol, tripropylene glycol, polypropylene glycol, and polytetramethylene glycol.
- diethylene glycol, triethylene Glycol and polyethylene glycol having a number average molecular weight of 150 to 4000 are preferable, and polyethylene glycol having a number average molecular weight of 300 to 2500, and particularly a number average molecular weight of 600 to 1500 is preferable. These may be used alone or in combination of two or more.
- Dihydroxy compound represented by formula (6) represents a substituted or unsubstituted C 2-20 carbons R 8, preferably an alkylene group having 2 to 10 carbon atoms, or the following formula (6A) It is a dihydroxy compound having a group.
- R 8 has a substituent
- examples of the substituent include an alkyl group having 1 to 5 carbon atoms.
- dihydroxy compounds represented by the formula (6) specific examples of the dihydroxy compound in which R 8 is a substituted or unsubstituted alkylene group having 2 to 20 carbon atoms include ethylene glycol, 1,2 -Propanediol, 1,3-propanediol, 1,2-butanediol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, etc. are easy to obtain and handle From the viewpoint of high reactivity during polymerization and the hue of the resulting polymer, 1,3-propanediol and 1,6-hexanediol are preferred. These may be used alone or in combination of two or more depending on the required performance of the polycarbonate resin to be obtained.
- Examples of the dihydroxy compound in which R 8 is an acetal ring group represented by the above formula (6A) include spiroglycol, and the dihydroxy compound having an acetal structure becomes a crosslinking point during the polymerization reaction and undergoes a crosslinking reaction.
- the structural unit derived from a dihydroxy compound having an acetal structure is preferably 10 mol% or less, more preferably 5 mol% or less, and more preferably 2 mol% or less with respect to the structural unit derived from all dihydroxy compounds. Is more preferable, and among them, 0 mol% is most preferable.
- the polycarbonate resin of the present invention is suitable for molding various physical properties such as melt viscosity of the polycarbonate resin into a film.
- the dihydroxy compound represented by the above formula (2) is used as the structural unit (a) because it may be easy to adjust or the optical properties may be easily adjusted. It is represented by the derived structural unit, the dihydroxy compound represented by the formula (3), the dihydroxy compound represented by the formula (4), the dihydroxy compound represented by the formula (5) and the formula (6). And a structural unit derived from one or more dihydroxy compounds selected from the group consisting of dihydroxy compounds.
- the structural unit derived from the dihydroxy compound represented by the formula (3) the structural unit derived from the dihydroxy compound represented by the formula (4), and the dihydroxy compound represented by the formula (5).
- the structural unit derived from the structural unit and the dihydroxy compound represented by the formula (6) the structural unit derived from the dihydroxy compound represented by the formula (4) and / or the formula (5). It preferably contains a structural unit derived from a dihydroxy compound, and more preferably contains a structural unit derived from the dihydroxy compound represented by the formula (5).
- R 1 to R 4 are each independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted carbon group having 6 to 20 carbon atoms, Represents a cycloalkyl group or a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, and the same or different groups are arranged as each of the four substituents on each benzene ring.
- X 1 and X 2 are each independently a substituted or unsubstituted alkylene group having 2 to 10 carbon atoms, a substituted or unsubstituted cycloalkylene group having 6 to 20 carbon atoms, or a substituted or unsubstituted carbon.
- examples of the substituent that R 1 to R 4 and X 1 and X 2 may have include an alkoxy group such as a methoxy group, an ethoxy group, and a propoxy group, and an aryl group such as a phenyl group and a naphthyl group. Can be mentioned.
- R 1 to R 4 are each independently preferably a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 15 carbon atoms, and R 1 to R 4 Of R 4 , R 1 and R 2 are preferably unsubstituted alkyl groups, or R 1 to R 4 are all hydrogen atoms.
- R 1 to R 4 are substituents other than a hydrogen atom, it is preferably bonded to the 3rd or 5th position with respect to the bonding position of the benzene ring to the fluorene ring.
- the unsubstituted alkyl group A methyl group or an ethyl group is preferred.
- X 1 and X 2 are each independently preferably an alkylene group having 1 to 4 carbon atoms, more preferably an unsubstituted methylene group, an unsubstituted ethylene group, or an unsubstituted propylene group, and X 1 and X 2 Are preferably the same.
- n and n are each independently an integer of 0 to 5, but the degree of polymerization of the polycarbonate resin is adjusted, the glass transition temperature of the polycarbonate resin is adjusted to a temperature suitable for melt molding, and the toughness of the resulting film is adjusted. Since it can be improved, it is preferably 1 or more. Further, m and n are preferably the same integer.
- the dihydroxy compound represented by the formula (1) preferably has a symmetric structure with the symmetry axis of the fluorene ring as the symmetry axis.
- dihydroxy compound represented by the formula (1) examples include 9,9-bis (4-hydroxyphenyl) fluorene, 9,9-bis (4-hydroxy-3-methylphenyl) fluorene, 9 , 9-bis (4-hydroxy-3-ethylphenyl) fluorene, 9,9-bis (4-hydroxy-3-n-propylphenyl) fluorene, 9,9-bis (4-hydroxy-3-isopropylphenyl) Fluorene, 9,9-bis (4-hydroxy-3-n-butylphenyl) fluorene, 9,9-bis (4-hydroxy-3-sec-butylphenyl) fluorene, 9,9-bis (4-hydroxy- 3-tert-propylphenyl) fluorene, 9,9-bis (4-hydroxy-3-cyclohexylphenyl) fluorene, 9,9-bis 4-hydroxy-3-phenylphenyl) fluorene, 9,9-bis (4- (2-hydroxyethoxy) phenyl) fluorene,
- the polycarbonate resin of the present invention may contain only one type of structural unit derived from the dihydroxy compound represented by the formula (1), or may contain two or more types.
- the polycarbonate resin of the present invention may contain structural units derived from other dihydroxy compounds in addition to the structural units derived from the dihydroxy compounds represented by the formulas (1) to (6).
- dihydroxy compounds include bisphenols.
- 2,2-bis (4-hydroxyphenyl) propane 1,1-bis (4-hydroxyphenyl) -2-ethylhexane, 1,1-bis (4-hydroxyphenyl) decane is preferred, and 2,2-bis (4-hydroxyphenyl) propane is particularly preferred.
- the structural unit derived from such a dihydroxy compound is polycarbonate. It is preferably used at 50 mol% or less, more preferably at most 20 mol%, further preferably at 5 mol% or less, based on the total of structural units derived from dihydroxy compounds in the resin.
- the polycarbonate resin of the invention preferably does not contain a structural unit derived from a dihydroxy compound having an aromatic ring in the structure other than that represented by the formula (1).
- polyester carbonate in which a part of the carbonate bond of the polycarbonate is substituted with a dicarboxylic acid structure can also be used.
- dicarboxylic acid compound forming the dicarboxylic acid structure include terephthalic acid, phthalic acid, isophthalic acid, 4,4′-diphenyldicarboxylic acid, 4,4′-diphenylether dicarboxylic acid, 4,4′-benzophenone dicarboxylic acid, 4 , 4′-diphenoxyethanedicarboxylic acid, 4,4′-diphenylsulfone dicarboxylic acid, aromatic dicarboxylic acid such as 2,6-naphthalenedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, Examples include alicyclic dicarboxylic acids such as 1,4-cyclohexanedicarboxy
- Aromatic dicarboxylic acids are preferred, especially from handling and easy availability, terephthalic acid, isophthalic acid are preferred, with preference terephthalic acid.
- These dicarboxylic acid components can be used as the raw material for the polymer of the present invention as dicarboxylic acid itself, but depending on the production method, dicarboxylic acid esters such as methyl ester and phenyl ester, and dicarboxylic acids such as dicarboxylic acid halides can be used.
- An acid derivative can also be used as a raw material.
- the content ratio of the structural unit derived from the dicarboxylic acid compound is 45 mol% or less when the total of the structural units derived from the total dihydroxy compound and the total carboxylic acid compound is 100 mol%. It is preferable that the amount is 40 mol% or less. When the content ratio of the dicarboxylic acid compound is more than 45 mol%, the polymerizability is lowered and the polymerization may not proceed to a desired molecular weight.
- the polycarbonate resin of the present invention includes a structural unit derived from the dihydroxy compound represented by the above formula (1) as the structural unit (b), and represented by the above formulas (2) to (6) as the structural unit (a).
- the content ratio of each structural unit is preferably as follows.
- the content ratio of the structural unit derived from the dihydroxy compound represented by the formula (1) is 40% by weight or more with respect to the total of the structural units derived from the dihydroxy compound contained in the polycarbonate resin of the present invention. It is preferably 45% by weight or more, more preferably 50% by weight or more.
- the content ratio of the structural unit is excessively small, the wavelength dispersion characteristics of the obtained retardation film may not be preferable.
- the value of the formula (A) may be excessively large and the optical characteristics may not be preferable.
- the dihydroxy compound included in the polycarbonate resin of the present invention It is preferably 95% by weight or less, particularly 90% by weight or less, particularly 85% by weight or less, and particularly preferably 80% by weight or less, based on the total of derived structural units.
- regulated by weight% is a content rate of the repeating unit structure of the dihydroxy compound containing a carbonate bond with respect to polycarbonate resin total weight.
- the polycarbonate resin of this invention contains the structural unit derived from the dihydroxy compound represented by the said Formula (2), with respect to the sum total of the structural unit derived from the dihydroxy compound contained in polycarbonate resin, the said formula (The content ratio of the structural unit derived from the dihydroxy compound represented by 2) is preferably 20% by weight or more, more preferably 25% by weight or more, and further preferably 30% by weight or more. When the content ratio of the structural unit is excessively small, the retardation of the obtained retardation film may be excessively small.
- the content ratio of the structural unit is excessively large, the glass transition temperature of the polycarbonate resin of the present invention is excessively high and film formation becomes difficult, so the total of the structural units derived from the dihydroxy compound contained in the polycarbonate resin. Is preferably 50% by weight or less, and particularly preferably 45% by weight or less.
- the polycarbonate resin of the present invention includes a dihydroxy compound represented by the formula (3), a dihydroxy compound represented by the formula (4), a dihydroxy compound represented by the formula (5), and the formula (6).
- the content is based on the total of structural units derived from dihydroxy compounds contained in the polycarbonate resin. It is preferably 0.1% by weight or more and less than 4.5% by weight, more preferably 0.1% by weight or more and 4.0% by weight or less, still more preferably 0.2% by weight or more and 3.0% by weight or less. is there.
- the polycarbonate resin of the present invention preferably has a glass transition temperature of 120 ° C. or higher and 160 ° C. or lower, more preferably 130 ° C. or higher and 155 ° C. or lower, particularly 140 ° C. or higher and 150 ° C. or lower. If the glass transition temperature is too high, melt film formation may be difficult, and if it is too low, the optical properties of the retardation film may change due to environmental changes.
- the structural unit derived from the dihydroxy compound represented by any one of the structural units derived from the dihydroxy compound represented by the formulas (3) to (6) is used. It may contain, may contain the structural unit derived from the dihydroxy compound represented by 2 or more types, and it is formed into a film whether it contains the structural unit derived from which dihydroxy compound Although it determines suitably so that the required characteristic according to the use of retardation film may be satisfy
- the content of the structural unit derived from the dihydroxy compound represented by the above formulas (3) to (6) is 0.1% by weight with respect to the total of the structural unit derived from the dihydroxy compound contained in the polycarbonate resin. It is preferably at least 4.5% by weight, more preferably at least 0.1% by weight and at most 4.0% by weight, even more preferably at least 0.2% by weight and at most 3.0% by weight.
- the polycarbonate resin of the present invention can be produced by a generally used polymerization method, and the polymerization method can be any of an interfacial polymerization method using phosgene and a melt polymerization method in which a dihydroxy compound and a carbonic acid diester are transesterified.
- the interfacial polymerization method not only requires the use of highly toxic phosgene and chlorinated solvents such as methylene chloride and chlorobenzene, which cause environmental destruction, but even a small amount of chlorinated solvent remains in the polycarbonate.
- the chlorine-containing components that volatilize during raw film formation and stretching operations may cause corrosion and damage to the film forming apparatus and stretching apparatus, and may adversely affect other members even after being assembled as a retardation plate. Therefore, a melt polymerization method in which a dihydroxy compound and a carbonic acid diester are reacted without using a solvent in the presence of a polymerization catalyst is preferable. Arbitrariness.
- the polyester carbonate resin according to the present invention can also be produced by a generally used polymerization method.
- a method in which a dihydroxy compound and a dicarboxylic acid or a dicarboxylic acid halide and phosgene are reacted in the presence of a solvent, a dihydroxy compound and a dicarboxylic acid or Any method of melt polymerization in which a dicarboxylic acid ester and a carbonic acid diester are transesterified without using a solvent may be used, but for the same reason as described above, a dihydroxy compound and a dicarboxylic acid or dicarboxylic acid ester A melt polymerization method in which a carbonic acid diester is reacted is preferable.
- Examples of the carbonic acid diester used in this melt polymerization method include those represented by the following formula (10).
- a 1 and A 2 are each independently a substituted or unsubstituted aliphatic group having 1 to 18 carbon atoms, or a substituted or unsubstituted C 6 to C 18 carbon atom. It is an aromatic group.
- Examples of the carbonic acid diester represented by the formula (10) are represented by diphenyl carbonate, ditolyl carbonate, bis (chlorophenyl) carbonate, m-cresyl carbonate, dinaphthyl carnate, bis (biphenyl) carbonate, and the like.
- Examples include dialkyl carbonates represented by diaryl carbonates, dimethyl carbonate, diethyl carbonate, dibutyl carbonate, dicyclohexyl carbonate and the like. Of these, diaryl carbonates are preferably used, and diphenyl carbonate is particularly preferably used.
- These carbonic acid diesters may be used alone or in combination of two or more.
- the carbonic acid diester is preferably used in a molar ratio of 0.90 to 1.10, more preferably 0.96 to 1.05, based on all dihydroxy compounds used in the reaction. Particularly preferably, it is used in a molar ratio of 0.98 to 1.03. Further, when obtaining a polyester carbonate resin, it is preferably used in a molar ratio of 0.90 to 1.10 with respect to the number of moles of dihydroxy compound obtained by subtracting the number of moles of all dicarboxylic acids from the number of moles of all dihydroxy compounds. More preferably, it is used in a molar ratio of 0.96 to 1.05, particularly preferably 0.98 to 1.03.
- an alkali metal compound and / or an alkaline earth metal compound is used as a polymerization catalyst (transesterification catalyst) in melt polymerization.
- a basic compound such as a basic boron compound, a basic phosphorus compound, a basic ammonium compound, or an amine compound can be used in combination with an alkali metal compound and / or an alkaline earth metal compound. It is particularly preferred to use only metal compounds and / or alkaline earth metal compounds.
- alkali metal compound used as the polymerization catalyst examples include sodium hydroxide, potassium hydroxide, lithium hydroxide, cesium hydroxide, sodium hydrogen carbonate, potassium hydrogen carbonate, lithium hydrogen carbonate, cesium hydrogen carbonate, sodium carbonate, potassium carbonate.
- alkaline earth metal compound examples include calcium hydroxide, barium hydroxide, magnesium hydroxide, strontium hydroxide, calcium hydrogen carbonate, barium hydrogen carbonate, magnesium hydrogen carbonate, strontium hydrogen carbonate, calcium carbonate, barium carbonate, Examples include magnesium carbonate, strontium carbonate, calcium acetate, barium acetate, magnesium acetate, strontium acetate, calcium stearate, barium stearate, magnesium stearate, strontium stearate, etc. preferable.
- alkali metal and “alkaline earth metal” are referred to as “Group 1 element” and “Group 2 element” in the long-period periodic table (Nomenclature of Inorganic Chemistry IUPAC Recommendations 2005), respectively. Used synonymously with
- alkali metal compounds and / or alkaline earth metal compounds may be used alone or in combination of two or more.
- basic boron compounds used in combination with alkali metal compounds and / or alkaline earth metal compounds include tetramethyl boron, tetraethyl boron, tetrapropyl boron, tetrabutyl boron, trimethylethyl boron, trimethylbenzyl boron, trimethyl Sodium salt such as phenyl boron, triethylmethyl boron, triethylbenzyl boron, triethylphenyl boron, tributylbenzyl boron, tributylphenyl boron, tetraphenyl boron, benzyltriphenyl boron, methyltriphenyl boron, butyltriphenyl boron, potassium salt, lithium Examples thereof include salts, calcium salts, barium salts, magnesium salts, and strontium salts.
- Examples of the basic phosphorus compound include triethylphosphine, tri-n-propylphosphine, triisopropylphosphine, tri-n-butylphosphine, triphenylphosphine, tributylphosphine, and quaternary phosphonium salts.
- Examples of the basic ammonium compound include tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide, trimethylethylammonium hydroxide, trimethylbenzylammonium hydroxide, trimethylphenylammonium hydroxide, Triethylmethylammonium hydroxide, triethylbenzylammonium hydroxide, triethylphenylammonium hydroxide, tributylbenzylammonium hydroxide, tributylphenylammonium hydroxide, tetraphenylammonium hydroxide, benzyltriphenylammonium hydroxide, methyltriphenylammonium hydride Kishido, butyl triphenyl ammonium hydroxide, and the like.
- amine compounds include 4-aminopyridine, 2-aminopyridine, N, N-dimethyl-4-aminopyridine, 4-diethylaminopyridine, 2-hydroxypyridine, 2-methoxypyridine, 4-methoxypyridine, 2 -Dimethylaminoimidazole, 2-methoxyimidazole, imidazole, 2-mercaptoimidazole, 2-methylimidazole, aminoquinoline and the like.
- the amount of the polymerization catalyst used is usually within a range of 0.1 ⁇ mol to 100 ⁇ mol as a metal conversion amount with respect to 1 mol of all dihydroxy compounds used in the reaction. Used, preferably in the range of 0.5 ⁇ mol to 50 ⁇ mol, more preferably in the range of 1 ⁇ mol to 25 ⁇ mol. If the amount of the polymerization catalyst used is too small, the polymerization activity necessary to produce a polycarbonate resin having a desired molecular weight cannot be obtained. On the other hand, if the amount of the polymerization catalyst used is too large, the hue of the resulting polycarbonate resin deteriorates. However, by-products are generated and fluidity is lowered and gel is generated more frequently, making it difficult to produce a polycarbonate resin having a target quality.
- transesterification catalysts such as a titanium compound, a tin compound, a germanium compound, an antimony compound, a zirconium compound, a lead compound, an osmium compound, are used together with or without the above basic compound. Can also be used.
- the amount of these transesterification catalysts used is usually in the range of 10 ⁇ mol to 1 mmol, preferably in the range of 20 ⁇ mol to 800 ⁇ mol, particularly preferably in terms of metal relative to 1 mol of all dihydroxy compounds used in the reaction. Is in the range of 50 ⁇ mol to 500 ⁇ mol.
- the dihydroxy compound represented by the formula (1) may be supplied as a solid or heated and supplied in a molten state.
- the melting point of the dihydroxy compound represented by 1) is higher than 150 ° C., there is a possibility of coloring or the like when melted alone. Therefore, the melting point is higher than that of the diester carbonate and the dihydroxy compound represented by the formula (1). It is preferable to supply it by dissolving in other dihydroxy compounds having a low molecular weight.
- each of the one or more dihydroxy compounds selected from the group consisting of the dihydroxy compounds represented by the formula (6) may be supplied as solids or heated and supplied in a molten state. If it is soluble in water, it may be supplied as an aqueous solution. The same applies to other dihydroxy compounds and dicarboxylic acid compounds.
- a dihydroxy compound and, if necessary, a dicarboxylic acid compound are reacted with a carbonic acid diester in the presence of a polymerization catalyst.
- the polymerization is usually carried out in a multistage process having two or more stages, and the polymerization reactor may be carried out in two or more stages by changing the conditions by one, or using two or more reactors, respectively.
- two or more, preferably three or more, more preferably three to five, and particularly preferably four reactions may be performed.
- the polymerization reaction may be a batch type, a continuous type, or a combination of a batch type and a continuous type, but a continuous type is preferred from the viewpoint of production efficiency and quality stability.
- the polymerization catalyst can be added to the raw material preparation tank, the raw material storage tank, or can be added directly to the polymerization tank. From the viewpoint of supply stability and polymerization control, the polymerization catalyst is supplied to the polymerization tank. It is preferable that a catalyst supply line is installed in the middle of the raw material line before being supplied and supplied as an aqueous solution or a phenol solution. If the temperature of the polymerization reaction is too low, it may cause a decrease in productivity and an increase in the thermal history of the product, and if it is too high, it may not only cause the vaporization of the monomer, but also promote the decomposition and coloring of the polymer of the present invention. There is.
- the melt polymerization reaction for obtaining the polymer of the present invention, it is important to control the balance between temperature and pressure in the reaction system. If either one of the temperature and the pressure is changed too quickly, unreacted monomers will be distilled out of the reaction system, and the molar ratio of the dihydroxy compound and the carbonic acid diester may change, and the desired polymer may not be obtained.
- the first stage reaction is carried out at a temperature of 130 ° C. to 250 ° C., preferably 140 ° C. to 240 ° C., more preferably 150 ° C. to 230 ° C. as the maximum internal temperature of the polymerization reactor.
- the maximum internal temperature is 210 ° C. to 270 ° C., preferably 220 ° C. to 250 ° C., usually 0.1 to 10 hours, preferably 0.5 to 6 hours, particularly preferably 5 kPa or less, preferably 3 kPa. For 1 to 3 hours.
- the maximum internal temperature in all reaction stages is 270 ° C. or less, particularly 260 ° C. or less. Is preferred.
- a horizontal reactor with excellent plug flow and interface renewability at the final stage of polymerization it is necessary to use a horizontal reactor with excellent plug flow and interface renewability at the final stage of polymerization. preferable.
- the polymer of the present invention is usually cooled and solidified after polycondensation as described above, and pelletized with a rotary cutter or the like.
- the method of pelletization is not limited, but it is extracted from the final polymerization reactor in a molten state, cooled and solidified in the form of a strand, and pelletized, or from the final polymerization reactor in a molten state, uniaxial or biaxial extrusion.
- the resin is supplied to the machine, melt-extruded, cooled and solidified into pellets, or extracted from the final polymerization reactor in a molten state, cooled and solidified in the form of strands, once pelletized, and then uniaxially again
- a method may be mentioned in which resin is supplied to a biaxial extruder, melt-extruded, cooled and solidified, and pelletized.
- the monohydroxy compound is removed using an extruder, and in particular, the resin is fed from the final polymerization reactor to a uniaxial or biaxial extruder having one or more vent ports in a molten state, and the vent ports
- a method is preferably used in which the mixture is melt-extruded while removing the monohydroxy compound under reduced pressure and then cooled and solidified to form pellets.
- the molecular weight of the polymer of the present invention such as the polycarbonate resin of the present invention can be represented by a reduced viscosity.
- the reduced viscosity of the polymer of the present invention was determined by using methylene chloride as a solvent and precisely adjusting the polymer concentration to 0.6 g / dL at a temperature of 20.0, as described in the Examples section below. Measured with an Ubbelohde viscometer at +/- 0.1 ° C.
- macromolecule of this invention Preferably it is 0.30 dL / g or more, More preferably, it is 0.35 dL / g or more.
- the upper limit of the reduced viscosity is preferably 1.20 dL / g or less, more preferably 1.00 dL / g or less, still more preferably 0.80 dL / g or less, particularly preferably 0.60 dL / g or less, particularly 0.50 dL / g. g or less is preferred.
- the reduced viscosity of the polymer is smaller than the above lower limit, there may be a problem that the mechanical strength of the obtained retardation film becomes small.
- the reduced viscosity is larger than the above upper limit value, the fluidity at the time of forming into a film is lowered, resulting in a problem that productivity is lowered, or it is difficult to remove foreign matters in the polymer by filtration. Therefore, there is a possibility that the quality of the film is deteriorated due to the difficulty in reducing foreign matter, the presence of bubbles in the film formation, and the occurrence of thickness spots.
- the polymer of the present invention such as the polycarbonate resin of the present invention has a melt viscosity at a temperature of 240 ° C. and a shear rate of 91.2 sec ⁇ 1 of preferably 500 Pa ⁇ sec to 5000 Pa ⁇ sec, more preferably 1000 Pa ⁇ sec. It is not less than 4000 Pa ⁇ sec, particularly preferably not less than 1500 Pa ⁇ sec and not more than 3000 Pa ⁇ sec.
- melt viscosity of the polymer is smaller than the above lower limit, there may be a problem that the mechanical strength of the obtained retardation film becomes small.
- melt viscosity is larger than the above upper limit value, the fluidity at the time of forming into a film is lowered, resulting in a problem that productivity is lowered, or it is difficult to remove foreign matters in the polymer by filtration. Therefore, there is a possibility that the quality of the film is deteriorated due to the difficulty in reducing foreign matter, the presence of bubbles in the film formation, and the occurrence of thickness spots.
- the polymer of the present invention such as the polycarbonate resin of the present invention, has a photoelastic coefficient of 45 ⁇ 10 4 measured by the method described later on the sheet obtained by press molding by the method described in the Examples section below. It is preferably ⁇ 12 Pa ⁇ 1 or less, and particularly preferably 35 ⁇ 10 ⁇ 12 Pa ⁇ 1 or less.
- the photoelastic coefficient of the polymer of the present invention is usually ⁇ 10 ⁇ 10 ⁇ 12 Pa ⁇ 1 or more, preferably 0 ⁇ 10 ⁇ 12 Pa ⁇ 1 or more, from the viewpoint of ease of production.
- the polymer of the present invention is produced by the melt polymerization method using carbonic acid diester as a raw material, and completely uses toxic phosgene and a chlorine-containing solvent that causes environmental destruction and equipment corrosion / damage.
- a monohydroxy compound such as phenol is by-produced in the polymerization reaction, so that it remains in the polymer of the present invention, volatilizes during film formation or stretching, and causes odor. This may cause a film defect.
- the monohydroxy compound remaining in the film after the polymer of the present invention is processed into a retardation film may change the optical properties of the retardation film due to environmental changes.
- the upper limit of the concentration of the monohydroxy compound contained in the polymer is usually 0.3% by weight, preferably 0.2% by weight, particularly preferably 0.15% by weight.
- the lower limit is better to solve the above problem, but it is difficult to make the monohydroxy compound remaining in the polymer zero by the melt polymerization method, and excessive labor is required for removal. Since it is necessary, it is usually 0.001% by weight, preferably 0.005% by weight, more preferably 0.01% by weight.
- the content of the monohydroxy compound can be quantified by a known method such as high performance liquid chromatography by dissolving the polymer of the present invention in a solvent.
- the polymer is devolatilized with an extruder as described above, and the pressure in the final polymerization tank is 3 kPa or less, preferably 2 kPa or less.
- the pressure in the final polymerization tank is 3 kPa or less, preferably 2 kPa or less.
- the dihydroxy compound represented by the formula (1) is used as the raw material for the polymer of the present invention, the equilibrium constant is large, and if the pressure is lowered too much, the molecular weight increases rapidly. Not only is it difficult to obtain a uniform product, but monohydroxy compounds that remain in equilibrium are proportional to the product of the polymer end group concentration. Thus, it is preferable to manufacture with a balanced end group.
- the hydroxyl group terminal concentration is preferably 30 ⁇ eq / g or less, particularly preferably 20 ⁇ eq / g or less.
- the hydroxyl terminal concentration can be quantified by 1 H-NMR or the like.
- the polymer of the present invention can be blended with one or more polymers for film formability, stretchability, and flexibility.
- Polymers to be blended include ⁇ -olefins such as ethylene and propylene, butadiene, isoprene, polymers having an aliphatic hydrocarbon structure composed of hydrogenated products thereof, styrene, ⁇ -methylstyrene, and other aromatics.
- Examples thereof include a copolymer, a polycarbonate resin, a polyester carbonate resin, a polyester resin, a polyamide resin, a polyphenylene ether resin, and a polyimide resin.
- a copolymer when the glass transition temperature of the polymer of the present invention is 140 ° C. or higher, blending with a polymer having a glass transition temperature of 100 ° C. or lower improves the film formability, stretchability, and flexibility while improving the film environment. The effect of suppressing changes in the optical properties of the retardation film due to changes is great.
- polystyrene resin, polycarbonate resin, polyester carbonate resin, and polyester resin are preferable.
- polyester resins polyethylene glycol, polypropylene glycol, and polytetramethylene glycol, which have a large effect on film formability, stretchability, and flexibility, are copolymerized.
- Polyester resin is preferred.
- the ratio of blending polymers with other structures is not particularly limited. However, if the amount added is too large, the optical performance of the polymer of the present invention such as transparency and wavelength dispersibility may be impaired, or may be affected by environmental changes. Since the optical properties of the retardation film may change, it is preferably 10% by weight or less, more preferably 5% by weight or less, and particularly preferably 3% by weight or less based on the total of the polymers.
- the blending can be carried out by mixing the above components simultaneously or in any order with a mixer such as a tumbler, V-type blender, nauter mixer, Banbury mixer, kneading roll, extruder, among others, an extruder, In particular, kneading with a twin screw extruder is preferred from the viewpoint of improving dispersibility.
- a mixer such as a tumbler, V-type blender, nauter mixer, Banbury mixer, kneading roll, extruder, among others, an extruder, In particular, kneading with a twin screw extruder is preferred from the viewpoint of improving dispersibility.
- the above-described compound components may be added simultaneously or in any order in a tumbler, V-type blender, nauter mixer, Banbury mixer, kneading roll, extruder.
- a method of mixing with the polymer of the present invention by a mixer such as the above can be mentioned.
- kneading with an extruder, particularly a twin screw extruder is preferable from the viewpoint of improving dispersibility.
- the resin composition of the present invention a method for producing the retardation film of the present invention by using a resin composition added with a carbodiimide compound (hereinafter sometimes referred to as “the resin composition of the present invention”) will be described.
- the resin composition of the present invention contains at least the above-described polymer of the present invention, preferably the polycarbonate resin of the present invention and a carbodiimide compound.
- the carbodiimide compound used in the present invention is preferably a carbodiimide compound (including a polycarbodiimide compound) having one or more carbodiimide groups in the molecule.
- a carbodiimide compound including a polycarbodiimide compound having one or more carbodiimide groups in the molecule.
- Those synthesized by a generally well-known method can be used. For example, an organophosphorus compound or organometallic compound is used as a catalyst, and various polyisocyanates synthesized by subjecting them to a decarboxylation condensation reaction in a solvent-free or inert solvent at a temperature of about 70 ° C. or higher are used. be able to.
- monocarbodiimide compounds include dicyclohexylcarbodiimide, diisopropylcarbodiimide, dimethylcarbodiimide, diisobutylcarbodiimide, dioctylcarbodiimide, t-butylisopropylcarbodiimide, diphenylcarbodiimide, di-t-butylcarbodiimide, di- ⁇ -naphthylcarbodiimide, and the like.
- dicyclohexylcarbodiimide or diisopropylcarbodiimide is preferred from the viewpoint of easy industrial availability.
- polycarbodiimide compound contained in the carbodiimide compound those produced by various methods can be used. Basically, conventional polycarbodiimide production methods (for example, US Pat. No. 2,941,956) , No. 47-33279, J. Org. Chem. 28, 2069-2075 (1963), Chemical Review 1981, Vol. 8 No. 4, p 619-621). Can do.
- organic diisocyanate that is a synthetic raw material in the production of the polycarbodiimide compound
- aromatic diisocyanates examples include aromatic diisocyanates, aliphatic diisocyanates, alicyclic diisocyanates, and mixtures thereof.
- the content of the carbodiimide compound of the present invention is 0.01 to 5 parts by weight with respect to 100 parts by weight of the polymer of the present invention such as the polycarbonate resin of the present invention. 05 to 4 parts by weight, more preferably 0.1 to 3 parts by weight.
- a retardation film obtained by forming the resin composition of the present invention is used as a retardation film for a liquid crystal display, etc. Even if it is used, the fluctuation of the phase difference is large, causing light leakage at the time of black display or causing a color shift to deteriorate the image quality.
- the content of the carbodiimide compound is more than 5 parts by weight, the transparency of the obtained retardation film is lowered, and the image quality is lowered when used as a retardation film.
- the polymer of the present invention can be blended with a heat stabilizer in order to prevent a decrease in molecular weight or a deterioration in hue during polymerization or molding.
- heat stabilizers examples include generally known hindered phenol heat stabilizers and / or phosphorus heat stabilizers.
- hindered phenol compounds include 2,6-di-tert-butylphenol, 2,4-di-tert-butylphenol, 2-tert-butyl-4-methoxyphenol, 2-tert-butyl- 4,6-dimethylphenol, 2,6-di-tert-butyl-4-methylphenol, 2,6-di-tert-butyl-4-ethylphenol, 2,5-di-tert-butylhydroquinone, n- Octadecyl-3- (3 ′, 5′-di-tert-butyl-4′-hydroxyphenyl) propionate, 2-tert-butyl-6- (3′-tert-butyl-5′-methyl-2′-hydroxy Benzyl) -4-methylphenyl acrylate, 2,2′-methylene-bis- (4-methyl-6-tert-butylpheno) 2,2'-methylene-bis- (6-cyclohexyl-4-methylphenol), 2,2'-ethoxyphenol
- Examples of phosphorus compounds include phosphorous acid, phosphoric acid, phosphonous acid, phosphonic acid, and esters thereof.
- triphenyl phosphite tris (nonylphenyl) phosphite, tris (2, 4-di-tert-butylphenyl) phosphite, tridecyl phosphite, trioctyl phosphite, trioctadecyl phosphite, didecyl monophenyl phosphite, dioctyl monophenyl phosphite, diisopropyl monophenyl phosphite, monobutyl diphenyl phosphite Phyto, monodecyl diphenyl phosphite, monooctyl diphenyl phosphite, bis (2,6-di-tert-butyl-4-methylphenyl) pentaeryth
- heat stabilizers may be used alone or in combination of two or more.
- the heat stabilizer when a film is formed using an extruder such as a melt extrusion method, the heat stabilizer may be formed by adding the heat stabilizer or the like to the extruder, or the extruder may be used in advance.
- the heat stabilizer or the like can be added to the resin composition, or can be added at the time of melt polymerization.
- it can mix
- the blending amount of these heat stabilizers is preferably 0.0001 parts by weight to 1 part by weight, based on 100 parts by weight of the polymer of the present invention such as the polycarbonate resin of the present invention, and 0.0005 parts by weight to 0.00. 5 parts by weight is more preferable, and 0.001 to 0.2 parts by weight is still more preferable.
- the resin composition of the present invention can be blended with an antioxidant generally known for the purpose of preventing oxidation.
- antioxidants examples include pentaerythritol tetrakis (3-mercaptopropionate), pentaerythritol tetrakis (3-lauryl thiopropionate), glycerol-3-stearyl thiopropionate, triethylene glycol-bis [3 -(3-tert-butyl-5-methyl-4-hydroxyphenyl) propionate], 1,6-hexanediol-bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], Pentaerythritol-tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 1, 3,5-trimethyl-2,4 6-tris (3,5-di-tert-butyl-4-hydroxybenzyl)
- the blending amount of these antioxidants is preferably 0.0001 to 0.5 parts by weight when the polymer of the present invention such as the polycarbonate resin of the present invention is 100 parts by weight.
- the resin composition of the present invention includes a nucleating agent, a flame retardant, an inorganic filler, an impact modifier, a foaming agent, a dye and pigment, etc., which are usually used in the resin composition within a range not impairing the object of the present invention. It does not matter even if it is done.
- the resin composition of the present invention can be produced by mixing the above components simultaneously or in any order with a mixer such as a tumbler, V-type blender, nauter mixer, Banbury mixer, kneading roll, or extruder.
- a mixer such as a tumbler, V-type blender, nauter mixer, Banbury mixer, kneading roll, or extruder.
- a method of forming a raw film using the polymer of the present invention a casting method in which the solvent is removed after casting in a solvent, a method of forming a melt without using a solvent, specifically T
- a melt extrusion method using a die a calender molding method, a heat press method, a co-extrusion method, a co-melting method, a multi-layer extrusion, an inflation molding method, etc.
- the melt extrusion method using a T-die is preferred because of the melt film-forming method, particularly the ease of subsequent stretching treatment.
- the forming temperature is preferably 265 ° C. or less, more preferably 260 ° C. or less, and particularly preferably 258 ° C. or less. If the molding temperature is too high, there is a possibility that defects due to the generation of foreign matters and bubbles in the obtained original film increase or the original film may be colored. However, if the molding temperature is too low, the viscosity of the polymer of the present invention becomes too high, it becomes difficult to mold the raw film, and it may be difficult to produce a uniform raw film, The lower limit of the molding temperature is usually 200 ° C. or higher, preferably 210 ° C. or higher, more preferably 220 ° C. or higher.
- the forming temperature of the raw film is a temperature at the time of forming in the melt film forming method, and is usually a value obtained by measuring the temperature at the die outlet for extruding the molten resin.
- the thickness of the original film is not limited, but if it is too thick, uneven thickness is likely to occur, and if it is too thin, it may cause breakage during stretching, so it is usually 50 ⁇ m to 200 ⁇ m, preferably 70 ⁇ m to 120 ⁇ m. Further, if there is unevenness in the thickness of the original film, there is a possibility of causing retardation in the retardation film. Therefore, the thickness of the portion used as the retardation film is preferably set thickness ⁇ 3 ⁇ m or less. It is more preferable that the thickness is ⁇ 2 ⁇ m or less, and it is particularly preferable that the set thickness is ⁇ 1 ⁇ m or less.
- the raw film thus obtained can be used as the retardation film of the present invention by stretching in at least one direction.
- various stretching methods such as free-end stretching, fixed-end stretching, free-end contraction, and fixed-end contraction can be used singly or simultaneously or sequentially.
- the stretching direction can be performed in various directions and dimensions such as a horizontal direction, a vertical direction, a thickness direction, and a diagonal direction, and is not particularly limited.
- a transverse uniaxial stretching method, a longitudinal and transverse simultaneous biaxial stretching method, a longitudinal and transverse sequential biaxial stretching method, and the like can be mentioned.
- any appropriate stretching machine such as a tenter stretching machine or a biaxial stretching machine can be used.
- the stretching temperature can be appropriately selected depending on the purpose.
- the stretching is performed at a temperature of Tg ⁇ 20 ° C. to Tg + 30 ° C., preferably Tg ⁇ with respect to the glass transition temperature (Tg) of the original film (that is, the polymer or resin composition that is the film forming material of the original film) It is carried out in the range of 10 ° C. to Tg + 20 ° C., more preferably Tg ⁇ 5 ° C. to Tg + 10 ° C. By selecting such conditions, the retardation value is likely to be uniform, and the film is less likely to become cloudy.
- the stretching temperature is 90 ° C. to 210 ° C., more preferably 100 ° C. to 200 ° C., and particularly preferably 100 ° C. to 180 ° C.
- the draw ratio is appropriately selected depending on the purpose, and the unstretched case is 1 time, preferably 1.1 times to 6 times, more preferably 1.5 times to 4 times, and still more preferably 1.8 times. It is 2 times or more and 3 times or less, and particularly preferably 2 times or more and 2.5 times or less. If the draw ratio is excessively large, not only may there be a break during stretching, but also the effect of suppressing fluctuations in optical properties due to long-term use under high temperature conditions may be reduced. There is a possibility that the intended optical characteristics cannot be imparted in terms of thickness.
- a heat setting treatment may be performed in a heating furnace after stretching, or the relaxation step may be performed by controlling the width of the tenter or adjusting the roll peripheral speed.
- the temperature of the heat setting treatment is 60 ° C. to Tg, preferably 70 ° C. to the glass transition temperature (Tg) of the original film (that is, the polymer or resin composition that is the film forming material of the original film).
- Tg glass transition temperature
- the temperature is in the range of Tg-5 ° C. If the heat treatment temperature is too high, the orientation of the molecules obtained by stretching is disturbed, and there is a possibility that the desired retardation will be greatly reduced.
- a relaxation step is provided, the stress generated in the stretched film can be removed by shrinking to 95% to 100% with respect to the width of the film widened by stretching.
- the treatment temperature applied to the film at this time is the same as the heat setting treatment temperature.
- the retardation film of the present invention can be produced by appropriately selecting and adjusting the processing conditions in such a stretching process.
- the retardation film may contain chlorine depending on the polymer production method or the raw film production method.
- the interfacial method is adopted as a method for producing a polymer or the casting method is adopted as a method for producing a raw film
- methylene chloride, chlorobenzene, etc. are converted into a polymer in the form of a residual solvent, and further to a retardation film.
- a chlorine-containing solvent is included, the chlorine-containing component that volatilizes during raw film formation or stretching operation may cause corrosion or breakage of the film-forming device or stretching device. After assembling as a phase difference plate, other members may be adversely affected.
- the residual solvent in the retardation film works like a plasticizer, it may cause a change in optical properties due to changes in the external environment such as temperature and humidity, so the chlorine component contained in the retardation film of the present invention Is preferably 50 ppm or less, more preferably 20 ppm or less, still more preferably 10 ppm or less, and particularly preferably 5 ppm or less as the weight of chlorine atoms.
- the chlorine-containing solvent is an organic solvent containing chlorine in the molecular structure.
- the content in the retardation film of the present invention is small, but it is usually 50 ppm by weight or less, more preferably 20 ppm by weight or less, more preferably 10 ppm.
- Weight ppm or less particularly preferably 5 ppm weight or less, and preferably 1 ppm by weight or less.
- a method of devolatilizing the obtained polymer using an extruder examples thereof include a method of drying with hot air, hot nitrogen, etc., a method of forming a film while devolatilizing with an extruder used for forming a raw film.
- the upper limit of the concentration of the monohydroxy compound contained in the retardation film of the present invention is usually 3000 ppm by weight, preferably 2000 ppm by weight, more preferably 1500 ppm by weight, and particularly preferably 1000 ppm by weight.
- the lower limit is better to solve the above problem, but it is difficult to make the monohydroxy compound remaining in the polymer obtained by the melt polymerization method zero, and excessive for removal. Since labor is required, it is usually 1 ppm by weight, preferably 10 ppm by weight, more preferably 100 ppm by weight.
- the final polymerization tank pressure is set to 3 kPa or less, preferably 2 kPa or less when the polymer of the present invention as a raw material is produced.
- Resin is supplied from a polymerization reactor to a uniaxial or biaxial extruder having one or more vent ports in a molten state, and the vent ports of the extruder are reduced in pressure to remove monohydroxy compounds or to form a raw film.
- the extruder to be used has a structure having a vent port and is formed while devolatilizing under reduced pressure, or a method of processing under vacuum or hot air after stretching the raw film or stretching, etc. A combination of two or more operations is effective.
- the content of the monohydroxy compound in the retardation film can be quantified by dissolving the retardation film in a solvent and using a known method such as high performance liquid chromatography.
- ⁇ (Iv) Film forming, stretching and cross-linking method ⁇ in order to suppress the movement of molecules and suppress the fluctuation of optical properties due to long-term use under high temperature conditions, an electron beam or the like is applied to the retardation film after film formation or stretched. A high-energy ray can be irradiated to form a crosslinked structure in the molecule. At this time, a compound having a double bond such as divinylbenzene or allyl (meth) acrylate or a polymer thereof can be blended with the polymer of the present invention in advance so as to easily form a crosslinked structure.
- a compound having a double bond such as divinylbenzene or allyl (meth) acrylate or a polymer thereof can be blended with the polymer of the present invention in advance so as to easily form a crosslinked structure.
- a compound having two or more double bond groups in the molecule such as isocyanurate and diallyl monoglycidyl isocyanuric acid can also be blended, and by including such a compound, irradiation with high energy rays such as heat and electron beam A cross-linked structure is formed in the molecule, and it becomes easy to suppress the movement of the molecule.
- the compounding amount of the compound having two or more unsaturated double bond groups in the molecule is 0.01 to 5 parts by weight, especially 0.05 parts by weight when the polymer of the present invention is 100 parts by weight. ⁇ 3 parts by weight are preferred.
- the intensity of the electron beam when irradiating the stretched film with an electron beam is preferably 5 kGy or more and 200 kGy or less, more preferably 10 kGy or more and 100 kGy or less.
- the irradiation intensity of the electron beam is less than 5 kGy, the effect of suppressing the fluctuation of the optical characteristics due to the long-term use of the retardation film is small, and when the irradiation intensity is more than 200 kGy, the retardation film causes breakage of the molecular chain. There is a possibility that the strength of the resin may be reduced or colored.
- the circularly polarizing plate of the present invention is formed by laminating the retardation film of the present invention on a polarizing plate.
- a well-known various structure is employable.
- a film prepared by adsorbing a dichroic substance such as iodine or a dichroic dye on various films by a conventionally known method, dyeing, crosslinking, stretching, and drying can be used.
- the image display device of the present invention uses such a circularly polarizing plate of the present invention, and makes use of the feature that there is no problem of deterioration in image quality even in long-term use under an environment where temperature conditions and humidity conditions are severe.
- it is used in various liquid crystal display devices, mobile devices and the like, and in particular, it is preferably used in an organic EL display which has recently attracted attention as a next-generation image display device.
- Photoelastic coefficient ⁇ Sample preparation> A polycarbonate resin sample (4.0 g), which was vacuum-dried at 80 ° C. for 5 hours, was pre-heated at a hot press temperature of 200 to 250 ° C. using a spacer having a width of 8 cm, a length of 8 cm and a thickness of 0.5 mm. After pressurizing for 1 minute under the condition of ⁇ 3 minutes and a pressure of 20 MPa, the entire spacer was taken out and cooled by a water tube cooling press at a pressure of 20 MPa for 3 minutes to produce a sheet. A sample was cut out from this sheet to a width of 5 mm and a length of 20 mm.
- DVE-3 vibration type viscoelasticity measuring device
- the emitted laser light is passed through the polarizer, sample, compensator, and analyzer in this order, picked up by a photodetector (photodiode), and passed through a lock-in amplifier with respect to the amplitude and distortion of the waveform of angular frequency ⁇ or 2 ⁇ .
- the phase difference was determined, and the strain optical coefficient O ′ was determined.
- the directions of the polarizer and the analyzer were orthogonal to each other, and each was adjusted so as to form an angle of ⁇ / 4 with respect to the extending direction of the sample.
- the photoelastic coefficient C was obtained from the following equation using the storage elastic modulus E ′ and the strain optical coefficient O ′.
- C O '/ E'
- the glass transition temperature of the polymer was measured by using a differential scanning calorimeter (DSC220, manufactured by SII Nano Technology) and heating rate of about 10 mg of retardation film at 10 ° C./min. The point at which the slope of the curved line of the step transition part of the glass transition and the straight line obtained by extending the base line on the low temperature side to the high temperature side is maximized according to JIS-K7121 (1987).
- the extrapolated glass transition start temperature which is the temperature of the intersection with the tangent drawn at, was determined and used as the glass transition temperature.
- Phenol content in polymer After approximately 1 g of polymer sample was precisely weighed and dissolved in 5 mL of methylene chloride to make a solution, acetone was added so that the total amount was 25 mL, and reprecipitation was performed. . The solution was filtered through a 0.2 ⁇ m disk filter and quantified by liquid chromatography. This measured value was defined as the phenol content of the retardation film.
- melt film forming property of raw film In order to evaluate melt film forming property, the following observation and evaluation were performed at the time of melt film forming of polycarbonate resin or polycarbonate resin composition.
- ⁇ A film having no defects when visually observed for the presence of foreign matter and bubbles in the film.
- X What has a defect when the presence or absence of the foreign material in a film and a bubble is observed visually.
- the ratio between the phase difference R (450) and the phase difference R (550) and the ratio between the phase difference R (650) and the phase difference R (550) were calculated.
- the retardation R 1 (450), retardation R 1 (550) and retardation R 1 (650) are measured for the retardation film after the stretching step, and the retardation film is measured at 90 ° C. for 48 hours.
- the phase difference R 2 (450), the phase difference R 2 (550), and the phase difference R 2 (650) after being held were measured.
- the organic EL panel used for evaluation was used after peeling off the antireflection film bonded to the surface in advance.
- the evaluation method was performed as shown below.
- the prepared panel was stored in a constant temperature oven at 90 ° C. for 48 hours (heating test), and then checked for unevenness by visual observation.
- ⁇ Unevenness could not be confirmed on the screen by visual observation, and a sharp black color was obtained.
- ⁇ Unevenness could not be confirmed on the screen by visual observation, but the black sharpness was reduced.
- X Unevenness was confirmed on the screen by visual observation.
- Glass transition temperature (Tg) The glass transition temperature of the raw film and the retardation film was measured by the same method as the glass transition temperature of the polymer described above.
- Isosorbide hereinafter may be abbreviated as “ISB”
- BHEPF 9,9- (4- (2-hydroxyethoxy) phenyl) fluorene
- the pressure in the reaction vessel is set to 6.67 kPa, and the heat medium temperature of the reaction vessel is increased to 230 ° C. in 15 minutes.
- the generated phenol was extracted out of the reaction vessel. Since the stirring torque of the stirrer increased, the temperature was raised to 250 ° C. in 8 minutes, and the pressure in the reaction vessel was reduced to 200 Pa or less in order to remove the generated phenol.
- DEG diethylene glycol
- the internal temperature was maintained at 220 ° C.
- the generated phenol was extracted out of the reaction vessel.
- the second step after reaching 13.3 kPa, the internal temperature was increased to 240 ° C. over 15 minutes.
- the pressure was maintained at 13.3 kPa.
- the pressure was reduced from 13.3 kPa to 200 Pa or less over 15 minutes.
- the phenol vapor produced as a by-product with the polymerization reaction is led to a reflux condenser at 100 ° C., and a monomer component contained in a small amount in the phenol vapor is returned to the polymerization reactor, and the non-condensed phenol vapor is led to a condenser at 45 ° C. And recovered.
- the content thus oligomerized is once restored to atmospheric pressure and then transferred to another polymerization reaction apparatus equipped with a stirring blade and a reflux condenser controlled at 100 ° C.
- the internal temperature was 260 ° C. and the pressure was 200 Pa in 50 minutes. Thereafter, the pressure was reduced to 133 Pa or less over 20 minutes, the pressure was restored when the predetermined stirring power was reached, and the content (polycarbonate resin L) was pulled out in the form of a strand. Only a part could be extracted.
- Example 1 After the polycarbonate resin A obtained in Synthesis Example 1 was vacuum dried at 80 ° C. for 5 hours, a single screw extruder (made by Isuzu Chemical Industries, screw diameter 25 mm, cylinder set temperature: 220 ° C.), T die (width 200 mm, set) A raw film having a thickness of 100 ⁇ m was prepared using a film forming apparatus equipped with a chill roll (set temperature: 120 to 130 ° C.) and a winder. A sample having a width of 6 cm and a length of 6 cm was cut out from the raw film, and thickness spots were measured.
- this sample was adjusted at a stretching temperature of 127 to 177 ° C. so that R 1 (550) was 130 ⁇ 20 nm, and a stretching speed of 720 mm / min (strain The film was uniaxially stretched 1 ⁇ 2.0 times at a speed of 1200% / min to obtain a retardation film. At this time, it extended
- Example 2 A retardation film was obtained in the same manner as in Example 1 except that the polycarbonate resin B obtained in Synthesis Example 2 was used. The obtained retardation film was evaluated, and the results are shown in Table 2.
- Example 3 A retardation film was obtained in the same manner as in Example 1 except that the polycarbonate resin C obtained in Synthesis Example 3 was used. The obtained retardation film was evaluated, and the results are shown in Table 2.
- Example 4 A retardation film was obtained in the same manner as in Example 1 except that the polycarbonate resin D obtained in Synthesis Example 4 was used. The obtained retardation film was evaluated, and the results are shown in Table 2.
- Example 5 A retardation film was obtained in the same manner as in Example 1 except that the polycarbonate resin E obtained in Synthesis Example 5 was used. The obtained retardation film was evaluated, and the results are shown in Table 2.
- Example 6 99.5 parts by weight of the polycarbonate resin G obtained in Synthesis Example 7 and 0.5 part by weight of a carbodiimide compound (trade name: Carbodilite LA-1 manufactured by Nisshinbo Industries, Ltd.) are twin-screw extruder (TEX30HSS- 32) was extruded at a resin temperature of 230 ° C., cooled and solidified with water, and then pelletized with a rotary cutter. After the obtained pellets were dried in the same manner as in Example 1, film formation and stretching were performed in the same manner to obtain a retardation film. The obtained retardation film was evaluated, and the results are shown in Table 2.
- a carbodiimide compound trade name: Carbodilite LA-1 manufactured by Nisshinbo Industries, Ltd.
- TEX30HSS- 32 twin-screw extruder
- Example 7 A retardation film was obtained in the same manner as in Example 1 except that the polycarbonate resin F obtained in Synthesis Example 6 was used. The obtained retardation film was evaluated, and the results are shown in Table 2.
- Example 8 After the polycarbonate resin I obtained in Synthesis Example 9 was vacuum dried at 80 ° C. for 5 hours, a single-screw extruder (manufactured by Isuzu Chemical Industries, screw diameter 25 mm, cylinder setting temperature: 220 ° C.), T-die (width 200 mm, setting) A raw film having a thickness of 95 ⁇ m was produced using a film forming apparatus equipped with a chill roll (set temperature: 120 to 130 ° C.) and a winder. A sample having a width of 12 cm and a length of 12 cm was cut out from the raw film, and thickness spots were measured. This sample was vacuum-dried at 100 ° C. for 3 days to remove volatile components such as phenol contained in the raw film.
- a single-screw extruder manufactured by Isuzu Chemical Industries, screw diameter 25 mm, cylinder setting temperature: 220 ° C.
- T-die width 200 mm, setting
- a raw film having a thickness of 95 ⁇ m was produced using
- the sample treated in this manner was adjusted with a batch-type biaxial stretching apparatus (Brookner Co., Ltd.) while adjusting the stretching temperature at 127 to 177 ° C. so that R 1 (550) was 130 ⁇ 20 nm. Min. (Strain rate 300% / min) was uniaxially stretched 1 ⁇ 2.0 times to obtain a retardation film. At this time, the film was stretched without being held in the direction perpendicular to the stretching direction. The obtained retardation film was evaluated, and the results are shown in Table 2.
- Example 9 A twin-screw extruder (TEX30HSS-32) manufactured by Nippon Steel Co., Ltd. having 1 vent part of polystyrene resin (manufactured by PS Japan, trade name: G9504) and 99 parts by weight of the polycarbonate resin I obtained in Synthesis Example 9 Then, while devolatilizing from a vent port using a vacuum pump, the resin was extruded at a resin temperature of 230 ° C., cooled and solidified with water, and then pelletized with a rotary cutter. After drying the obtained pellet similarly to Example 8, it formed into a film by the same method, the phenol etc. were removed and extended
- Example 10 99 parts by weight of the polycarbonate resin I obtained in Synthesis Example 9 and 1 part by weight of a polycarbonate (trade name: Novalex 7022J, made by Mitsubishi Chemical Co., Ltd.) containing bisphenol A as a dihydroxy compound component, manufactured by Nippon Steel Co., Ltd.
- a twin screw extruder TEX30HSS-32
- the resin was extruded from a vent port using a vacuum pump at a resin temperature of 230 ° C., cooled and solidified with water, and then pelletized with a rotary cutter. After drying the obtained pellet similarly to Example 8, it formed into a film by the same method, the phenol etc. were removed and extended
- the obtained retardation film was evaluated, and the results are shown in Table 2.
- Example 11 Polyester elastomer having 1,4-butanediol, terephthalic acid, and polytetramethylene glycol as constituents in 99 parts by weight of the polycarbonate resin I obtained in Synthesis Example 9 (Mitsubishi Chemical Corporation, trade name: Primalloy CP300H) 1 part by weight was extruded at a resin temperature of 230 ° C. using a twin screw extruder (TEX30HSS-32) manufactured by Nippon Steel Co., Ltd. having two vent ports while devolatilizing from the vent port using a vacuum pump. After cooling and solidifying, it was pelletized with a rotary cutter. After drying the obtained pellet similarly to Example 8, it formed into a film by the same method, the phenol etc. were removed and extended
- Example 12 A twin-screw extruder (TEX30HSS made by Nippon Steel Co., Ltd.) having 99 parts by weight of the polycarbonate resin I obtained in Synthesis Example 9, 1 part by weight of a polyester-based elastomer (manufactured by EASTMAN Chemical, trade name: ECDEL 9966) and two vent ports. -32), while devolatilizing from a vent port using a vacuum pump, the resin was extruded at a resin temperature of 230 ° C, cooled and solidified with water, and then pelletized with a rotary cutter. After drying the obtained pellet similarly to Example 8, it formed into a film by the same method, the phenol etc. were removed and extended
- Example 13 A retardation film was obtained in the same manner as in Example 8 except that instead of the polycarbonate resin I, the polycarbonate resin J obtained in Synthesis Example 10 was used to obtain an extruded film having a thickness of 103 ⁇ m. The obtained retardation film was evaluated, and the results are shown in Table 3.
- Example 14 A retardation film was obtained in the same manner as in Example 8, except that the polycarbonate resin K obtained in Synthesis Example 11 was used instead of the polycarbonate resin I. The obtained retardation film was evaluated, and the results are shown in Table 3.
- Example 15 A retardation film was obtained in the same manner as in Example 14 except that the polycarbonate resin J obtained in Synthesis Example 10 was used and the phenol film was not removed by vacuum treatment of the raw film. The obtained retardation film was evaluated, and the results are shown in Table 3.
- Example 16 A retardation film was obtained in the same manner as in Example 8 except that the polycarbonate resin H obtained in Synthesis Example 8 was used to obtain a 92 ⁇ m-thick original film. The obtained retardation film was subjected to a heat treatment at a heat treatment temperature of 100 ° C. and a heat treatment time of 1 minute. The obtained retardation film after the heat treatment was evaluated, and the results are shown in Table 3.
- the retardation film defined in the present invention has little fluctuation in retardation even after long-term use under high temperature conditions, is excellent in stability against temperature, has no unevenness in the image, and has a sharp black color.
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Abstract
Description
また、9,9-ビス[4-(2-ヒドロキシエトキシ)フェニル]フルオレン又は9,9-ビス(4-ヒドロキシ-3-メチルフェニル)フルオレンと炭素原子数4~20の脂環式ジオールやヘテロ原子含有環状ジヒドロキシ化合物との2元系共重合ポリカーボネート樹脂からなるフィルムが開示されている(特許文献3参照)。
ところが、特許文献2、3に開示されているポリカーボネート樹脂は、その分子構造に基づくフィルムの脆さによる原反フィルムの製膜のし難さや、その後の延伸加工のし難さが解消されておらず、位相差フィルムの画質の低下やむら、波長分散特性の長期使用時や厳しい使用環境に置かれた場合の変化についても満足ゆくものではなかった。
式(A):0.7<R1(450)/R1(550)<1
式(B):|R2(450)/R2(550)-R1(450)/R1(550)|<0.020
(ただし、上記R1(450)及びR1(550)はそれぞれ波長450nm及び550nmにおけるフィルム面内の位相差値を表し、上記R2(450)及びR2(550)はそれぞれ温度90℃において48時間放置した後の波長450nm及び550nmにおけるフィルム面内の位相差値を表す。)
式(C):1<R1(650)/R1(550)<1.2
式(D):|R2(650)/R2(550)-R1(650)/R1(550)|<0.010
(ただし、上記R1(650)は波長650nmにおけるフィルム面内の位相差値を表し、前記R2(650)は温度90℃において48時間放置した後の波長650nmにおけるフィルム面内の位相差値を表す。)
(上記式(3)中、R5は置換若しくは無置換の炭素数4~炭素数20のシクロアルキレン基を表す。)
HO-CH2-R6-CH2-OH (4)
(上記式(4)中、R6は置換若しくは無置換の炭素数4~炭素数20のシクロアルキレン基を表す。)
H-(O-R7)p-OH (5)
(上記式(5)中、R7は置換若しくは無置換の炭素数2~炭素数10のアルキレン基を表し、pは2~50の整数である。)
HO-R8-OH (6)
(上記式(6)中、R8は置換若しくは無置換の炭素数2~炭素数20のアルキレン基、又は下記式(6A)に示す基を表す。)
本発明の位相差フィルムは、下記式(A)及び(B)の関係を満たし、好ましくは更に下記式(C)及び(D)の関係を満たすものであり、好ましくは単層のフィルム(1枚のフィルム)で、下記式(A)及び(B)の関係を満たし、好ましくは更に下記式(C)及び(D)の関係を満たす。積層フィルムよりなる位相差フィルムは厚みが大きくなるため、本発明の位相差フィルムは単層フィルムよりなることが好ましい。
式(B):|R2(450)/R2(550)-R1(450)/R1(550)|<0.020
(ただし、上記R1(450)及びR1(550)はそれぞれ波長450nm及び550nmにおけるフィルム面内の位相差値を表し、上記R2(450)及びR2(550)はそれぞれ温度90℃において48時間放置した後の波長450nm及び550nmにおけるフィルム面内の位相差値を表す。)
式(D):|R2(650)/R2(550)-R1(650)/R1(550)|<0.010
(ただし、上記R1(650)は波長650nmにおけるフィルム面内の位相差値を表し、前記R2(650)は温度90℃において48時間放置した後の波長650nmにおけるフィルム面内の位相差値を表す。)
<式(A)>
本発明の位相差フィルムは、前記式(A)の関係を満たし、R1(450)/R1(550)が0.7より大きく1より小さいことを特徴とする。
本発明の位相差フィルムは、前記式(B)の関係を満たし、|R2(450)/R2(550)-R1(450)/R1(550)|(即ち、R2(450)/R2(550)とR1(450)/R1(550)の差の絶対値)が0.020より小さいことを特徴とする。
本発明の位相差フィルムは、前記式(C)の関係を満たし、R1(650)/R1(550)が1より大きく1.2より小さいことが好ましい。
本発明の位相差フィルムは、前記式(D)の関係を満たし、|R2(650)/R2(550)-R1(650)/R1(550)|(即ち、R2(650)/R2(550)とR1(650)/R1(550)の差の絶対値)が0.010より小さいことが好ましく、0.008以下であることがより好ましく、0.0075以下であることが特に好ましい。
本発明のガラス転移温度の測定法は実施例の項で記載する。
<厚み>
本発明の光学フィルムの厚みは、通常150μm以下であることが好ましく、100μm以下であることが更に好ましく、60μm以下であることがより好ましい。位相差フィルムの厚みが過度に厚いと、同じ面積のフィルムを製造するのにより多くの製膜材料が必要になり非効率であったり、当該フィルムを使用する製品の厚みが厚くなったりする可能性があると共に、均一性の制御が困難となり、精密性・薄型・均質性を求められる機器に適合できない場合がある。本発明の位相差フィルムの厚みの下限としては、好ましくは5μm以上、より好ましくは10μm以上である。位相差フィルムの厚みが過度に薄いとフィルムの取り扱いが困難になり、製造中にしわが発生したり、保護フィルムなどの他のフィルムやシートなどと貼合わせることが困難になったりすることがある。
本発明の位相差フィルムは、内部ヘイズが3%以下であることが好ましく、1.5%以下であることがより好ましい。位相差フィルムの内部ヘイズが上記上限値よりも大きいと光の散乱が起こり、例えば偏光子と積層した際、偏光解消を生じる原因となる。内部ヘイズの下限値は特に定めないが、通常0.2%以上である。
なお、光学フィルムの内部ヘイズは、例えば、ヘイズメーター(村上色彩技術研究所(株)製「HM-150」)を用いて、23℃において測定される。測定サンプルは、事前にヘイズ測定を行っておいた粘着剤付き透明フィルムを、試料フィルムの両面に貼り合せ、外部ヘイズの影響を除去した状態のものを作成して用い、測定値は、粘着剤付き透明フィルムのヘイズ値の差分を用いる。
本発明の位相差フィルムは、b*値が3以下であることが好ましい。位相差フィルムのb*値が大き過ぎると着色等の問題が生じる。本発明の位相差フィルムのb*値はより好ましくは2以下、特に好ましくは1以下である。
なお、位相差フィルムのb*値は、例えば、分光光度計(村上色彩技術研究所(株)製「DOT-3」)を用いて、23℃において波長550nmの光で測定される。
本発明の位相差フィルムは、厚みによらず、当該位相差フィルムそのものの全光線透過率が80%以上であることが好ましく、この透過率は90%以上であることが更に好ましい。透過率が上記下限以上であれば、着色の少ない位相差フィルムが得られ、偏光板と貼り合わせた際、偏光度や透過率の高い円偏光板となり、画像表示装置に用いた際に、高い表示品位を実現することが可能となる。なお、本発明の位相差フィルムの全光線透過率の上限は特に制限はないが通常99%以下である。
本発明の位相差フィルムは、ナトリウムd線(589nm)における屈折率が1.57~1.62であることが好ましい。この屈折率が1.57未満の場合には、複屈折が小さくなりすぎるおそれがある。一方、屈折率が1.62を超える場合には、反射率が大きくなり、光透過性が低下するおそれがある。
本発明の位相差フィルムは、複屈折が、0.001以上であることが好ましい。後述の本発明の樹脂組成物を用いて成形するフィルムの厚みを非常に薄く設計するためには、複屈折が高い方が好ましい。従って、複屈折は0.0015以上であることが特に好ましく、0.002以上であることが最も好ましい。複屈折が0.001未満の場合には、フィルムの厚みを過度に大きくする必要があるため、製膜材料の使用量が増え、厚み・透明性・位相差の点から均質性の制御が困難となる。そのため、複屈折が0.001未満の場合には、精密性・薄型・均質性を求められる機器に適合できない可能性がある。
複屈折の上限に特に制限はないが、複屈折を大きくするために、延伸温度を過度に下げたり、延伸倍率を過度に上げたりすると、延伸時の破断や延伸フィルムの不均一性を招くことがあるため、通常0.007以下である。
本発明の位相差フィルムは、吸水率が1.0重量%より大きいことが好ましい。吸水率が1.0重量%より大きければ、この位相差フィルムを他のフィルムなどと貼りあわせる際、容易に接着性を確保することができる。例えば、偏光板と貼りあわせる際、位相差フィルムが親水性であるため、水の接触角も低く、接着剤を自由に設計し易く、高い接着設計ができる。吸水率が1.0重量%以下の場合は、疎水性となり、水の接触角も高く、接着性の設計が困難になる。また、フィルムが帯電し易くなり、異物の巻き込み等、円偏光板、画像表示装置に組み込んだ際、外観欠点が多くなるという問題が生じる。一方、吸水率が2.0重量%より大きくなると湿度環境下での光学特性の耐久性が悪くなるため好ましくない。本発明の位相差フィルムは、吸水率が1.0重量%より大きく2.0重量%以下であることが好ましく、更に好ましくは1.1重量%以上1.5%重量以下である。
上記の条件を満足する本発明の位相差フィルムを作製する方法には特に制限はなく、上記条件を満たす位相差フィルムを作製することができる方法であればよいが、例えば、溶融製膜法により原反フィルムを得、必要に応じてこれを延伸して位相差フィルムを作製する際に、以下の(i)~(iv)の手段の1又は2以上を採用することにより、本発明の位相差フィルムを作製することができる。
(i) 位相差フィルムの製膜材料として用いる高分子の共重合組成比を調整する。
(ii) 位相差フィルムの製膜材料として反応性官能基を有する化合物を含む樹脂組成物を用いる。
(iii) 延伸工程での条件を調整する。
(iv) 製膜、延伸後、架橋させる。
以下に、製膜材料として用いる高分子の共重合組成比を調整することにより、本発明の位相差フィルムを作製する方法について説明する。
また、屈折率異方性の測定は、各構造単位のホモポリマーを製造し、前述の吸収端の測定で作製したのと同じ条件で作製したフィルムに対して、ホモポリマーのガラス転移温度+20℃の条件で、自由端一軸、2倍延伸を行い、得られた延伸フィルムに対してアッベ屈折計「DR-4」(アタゴ社製)で屈折率を測定し、延伸方向の屈折率が延伸方向と直交方向の屈折率よりも高ければ「正」、延伸の屈折率よりも延伸方向と直交方向の屈折率が高ければ「負」とした。
以下、本発明の高分子がポリカーボネート樹脂(以下、「本発明のポリカーボネート樹脂」と称す場合がある。)である場合を例示して、その構造単位等について説明するが、本発明の高分子は何らポリカーボネート樹脂に限定されるものではない。
本発明のポリカーボネート樹脂の前記構造単位(a)に好適に用いられる化合物としては、以下の式(2)~(6)で表されるジヒドロキシ化合物が挙げられる。
(上記式(3)中、R5は置換若しくは無置換の炭素数4~炭素数20のシクロアルキレン基を表す。)
(上記式(4)中、R6は置換若しくは無置換の炭素数4~炭素数20のシクロアルキレン基を表す。)
(上記式(5)中、R7は置換若しくは無置換の炭素数2~炭素数10のアルキレン基を表し、pは2~50の整数である。)
(上記式(6)中、R8は置換若しくは無置換の炭素数2~炭素数20のアルキレン基、又は下記式(6A)に示す基を表す。)
上記式(2)で表されるジヒドロキシ化合物としては、例えば、立体異性体の関係にあるイソソルビド、イソマンニド、イソイデットが挙げられる。これらは1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。これらのジヒドロキシ化合物のうち、資源として豊富に存在し、容易に入手可能な種々のデンプンから製造されるソルビトールを脱水縮合して得られるイソソルビドが、入手及び製造のし易さ、光学特性、成形性の面から最も好ましい。
前記式(3)で表されるジヒドロキシ化合物は、R5に置換若しくは無置換の炭素数4~炭素数20、好ましくは炭素数4~炭素数18のシクロアルキレン基を有する脂環式ジヒドロキシ化合物である。ここで、R5が置換基を有する場合、当該置換基としては、炭素数1~炭素数12の置換若しくは無置換のアルキル基が挙げられ、該アルキル基が置換基を有する場合、当該置換基としては、メトキシ基、エトキシ基、プロポキシ基等のアルコキシ基、フェニル基、ナフチル基等のアリール基等が挙げられる。
これらは、1種を単独で用いてもよく、2種以上を併用してもよい。
前記式(4)で表されるジヒドロキシ化合物は、R6に置換若しくは無置換の炭素数4~炭素数20、好ましくは炭素数3~炭素数18のシクロアルキレン基を有する脂環式ジヒドロキシ化合物である。ここで、R6が置換基を有する場合、当該置換基としては、置換若しくは無置換の炭素数1~炭素数12のアルキル基が挙げられ、該アルキル基が置換基を有する場合、当該置換基としては、メトキシ基、エトキシ基、プロポキシ基等のアルコキシ基、フェニル基、ナフチル基等のアリール基等が挙げられる。
前記式(5)で表されるジヒドロキシ化合物は、R7に置換若しくは無置換の炭素数2~炭素数10、好ましくは炭素数2~炭素数5のアルキレン基を有する化合物である。pは2~50、好ましくは2~30の整数である。
これらは、1種を単独で用いてもよく、2種以上を併用してもよい。
前記式(6)で表されるジヒドロキシ化合物は、R8に置換若しくは無置換の炭素数2~炭素数20、好ましくは炭素数2~炭素数10のアルキレン基、又は下記式(6A)に示す基を有するジヒドロキシ化合物である。R8のアルキレン基が置換基を有する場合、当該置換基としては炭素数1~5のアルキル基が挙げられる。
また、前記式(3)で表されるジヒドロキシ化合物に由来する構造単位、前記式(4)で表されるジヒドロキシ化合物に由来する構造単位、前記式(5)で表されるジヒドロキシ化合物に由来する構造単位及び前記式(6)で表されるジヒドロキシ化合物に由来する構造単位の中でも、前記式(4)で表されるジヒドロキシ化合物に由来する構造単位及び/又は前記式(5)で表されるジヒドロキシ化合物に由来する構造単位を含んでいることが好ましく、前記式(5)で表されるジヒドロキシ化合物に由来する構造単位を含んでいることがより好ましい。
本発明のポリカーボネート樹脂の前記構造単位(b)に好適に用いられる化合物としては、以下の式(1)で表されるジヒドロキシ化合物が挙げられる。
本発明のポリカーボネート樹脂は、前記式(1)~(6)で表されるジヒドロキシ化合物に由来する構造単位の他、更にその他のジヒドロキシ化合物に由来する構造単位を含んでいてもよい。
ビスフェノール類としては、例えば、2,2-ビス(4-ヒドロキシフェニル)プロパン(=ビスフェノールA)、2,2-ビス(4-ヒドロキシ-3,5-ジメチルフェニル)プロパン、2,2-ビス(4-ヒドロキシ-3,5-ジエチルフェニル)プロパン、2,2-ビス(4-ヒドロキシ-(3,5-ジフェニル)フェニル)プロパン、2,2-ビス(4-ヒドロキシ-3,5-ジブロモフェニル)プロパン、2,2-ビス(4-ヒドロキシフェニル)ペンタン、2,4’-ジヒドロキシ-ジフェニルメタン、ビス(4-ヒドロキシフェニル)メタン、ビス(4-ヒドロキシ-5-ニトロフェニル)メタン、1,1-ビス(4-ヒドロキシフェニル)エタン、1,1-ビス(4-ヒドロキシフェニル)-2-エチルヘキサン、1,1-ビス(4-ヒドロキシフェニル)デカン、2,2-ビス(4-ヒドロキシフェニル)オクタン、2,2-ビス(4-ヒドロキシフェニル)ノナン、2,2-ビス(4-ヒドロキシフェニル)デカン、1,3-ビス[2-(4-ヒドロキシフェニル)-2-プロピル]ベンゼン、3,3-ビス(4-ヒドロキシフェニル)ペンタン、1,1-ビス(4-ヒドロキシフェニル)シクロヘキサン、ビス(4-ヒドロキシフェニル)スルホン、2,4’-ジヒドロキシジフェニルスルホン、ビス(4-ヒドロキシフェニル)スルフィド、4,4’-ジヒドロキシジフェニルエーテル、4,4’-ジヒドロキシ-3,3’-ジクロロジフェニルエーテル、4,4’-ジヒドロキシ-2,5-ジエトキシジフェニルエーテル等が挙げられ、中でも、取扱いや入手のし易さ、溶融製膜に適したガラス転移温度への調整の観点からは、2,2-ビス(4-ヒドロキシフェニル)プロパン、1,1-ビス(4-ヒドロキシフェニル)-2-エチルヘキサン、1,1-ビス(4-ヒドロキシフェニル)デカンが好ましく、2,2-ビス(4-ヒドロキシフェニル)プロパンが特に好ましい。
本発明のポリカーボネート樹脂は、構造単位(b)として前記式(1)で表されるジヒドロキシ化合物に由来する構造単位を含み、構造単位(a)として、前記式(2)~(6)で表されるジヒドロキシ化合物に由来する構造単位を含む本発明のポリカーボネート樹脂である場合、各々の構造単位の含有割合は、以下の通りであることが好ましい。
本願発明において、重量%で規定するジヒドロキシ化合物に由来する構造単位の含有割合とは、ポリカーボネート樹脂全重量に対する、カーボネート結合を含むジヒドロキシ化合物の繰り返し単位構造の含有割合である。
本発明のポリカーボネート樹脂は、中でもガラス転移温度が120℃以上160℃以下、更には130℃以上155℃以下、特には140℃以上150℃以下であるものが好ましい。ガラス転移温度が高すぎると溶融製膜が困難になる可能性があり、低すぎると環境変化により位相差フィルムの光学的特性が変化する可能性がある。
中でも、前記式(1)及び(2)で表されるジヒドロキシ化合物に由来する構造単位に加えて、前記式(5)で表されるジヒドロキシ化合物に由来する構造単位を有することが好ましく、更に好ましくは数平均分子量150~4000のポリエチレングリコール、より好ましくは数平均分子量300~2000のポリエチレングリコール、特に好ましくは数平均分子量600~1500のポリエチレングリコールを、ポリカーボネート樹脂中のジヒドロキシ化合物に由来する構造単位の合計に対して0.5重量%以上4重量%以下、中でも1重量%以上3重量%以下含むことが好適である。
本発明のポリカーボネート樹脂は、一般に用いられる重合方法で製造することができ、その重合方法は、ホスゲンを用いた界面重合法、ジヒドロキシ化合物と炭酸ジエステルとエステル交換反応させる溶融重合法のいずれの方法でもよいが、界面重合法は、毒性の強いホスゲンや環境破壊の原因となる塩化メチレン、クロロベンゼン等の含塩素溶媒を用いなければならないだけでなく、含塩素溶媒がポリカーボネート中に微量でも残存していると、原反製膜や延伸操作の際に揮発する含塩素成分により、製膜装置や延伸装置の腐食や破損を招いたり、位相差板として組み立てた後にも他の部材に悪影響を与えたりする可能性があるため、重合触媒の存在下にジヒドロキシ化合物と炭酸ジエステルとを溶媒を用いずに反応させる溶融重合法が好ましい。
これらの炭酸ジエステルは、1種を単独で用いても良く、2種以上を混合して用いてもよい。
尚、本明細書において「アルカリ金属」及び「アルカリ土類金属」という用語を、それぞれ、長周期型周期表(Nomenclature of Inorganic Chemistry IUPAC Recommendations2005)における「第1族元素」及び「第2族元素」と同義として用いる。
更に、前記式(2)で表されるジヒドロキシ化合物や、前記式(3)で表されるジヒドロキシ化合物、前記式(4)で表されるジヒドロキシ化合物、前記式(5)で表されるジヒドロキシ化合物及び前記式(6)で表されるジヒドロキシ化合物からなる群より選ばれた一種以上のジヒドロキシ化合物それぞれについては、固体として供給してもよいし、加熱して溶融状態として供給してもよいし、水に可溶なものであれば、水溶液として供給してもよい。その他のジヒドロキシ化合物及びジカルボン酸化合物についても同様である。
重合反応の温度は、低すぎると生産性の低下や製品への熱履歴の増大を招き、高すぎるとモノマーの揮散を招くだけでなく、本発明の高分子の分解や着色を助長する可能性がある。
〈還元粘度〉
本発明のポリカーボネート樹脂等の本発明の高分子の分子量は、還元粘度で表すことができる。本発明の高分子の還元粘度は、後掲の実施例の項に記載されるように、溶媒として塩化メチレンを用い、高分子濃度を0.6g/dLに精密に調整し、温度20.0℃±0.1℃でウベローデ粘度管を用いて測定される。本発明の高分子の還元粘度に特に制限は無いが、好ましくは0.30dL/g以上であり、より好ましくは0.35dL/g以上である。還元粘度の上限は、好ましくは1.20dL/g以下、より好ましくは1.00dL/g以下、更に好ましくは0.80dL/g以下、特に好ましくは0.60dL/g以下、中でも0.50dL/g以下が好適である。
本発明のポリカーボネート樹脂等の本発明の高分子は、温度240℃、せん断速度91.2sec-1での溶融粘度が、好ましくは500Pa・sec以上5000Pa・sec以下であり、より好ましくは1000Pa・sec以上4000Pa・sec以下、特に好ましくは1500Pa・sec以上3000Pa・sec以下である。
本発明のポリカーボネート樹脂等の本発明の高分子は、後述の実施例の項に記載される方法でプレス成形して得られたシートについて、後述の方法で測定された光弾性係数が45×10-12Pa-1以下であることが好ましく、特には35×10-12Pa-1以下であることが好ましい。光弾性係数が大き過ぎると、この高分子を成形して得られた位相差フィルムを円偏光板に貼り合わせ、更にこの偏光板を画像表示装置に搭載させたときに、貼り合わせ時の応力により、視認環境やバックライトの熱で位相差フィルムに部分的応力がかかり、不均一な位相差変化が生じ、著しい画像品質の低下が起きるという問題が生じる。本発明の高分子の光弾性係数は、製造上の容易性という点で、通常-10×10-12Pa-1以上、好ましくは0×10-12Pa-1以上である。
本発明の高分子は上記のように、炭酸ジエステルを原料とした溶融重合法で製造することで、毒性の強いホスゲンや環境破壊や装置腐食・破損の原因となる含塩素溶媒を全く使用することなく得ることができるが、溶融重合法では重合反応においてフェノール等のモノヒドロキシ化合物が副生するため、これが本発明の高分子中に残存し、フィルム製膜時や延伸時に揮発して、臭気の原因となったり、フィルムの欠陥を招いたりすることがある。また、本発明の高分子が位相差フィルムに加工された後に、該フィルム中に残存しているモノヒドロキシ化合物は、環境変化により位相差フィルムの光学的特性を変化させることがあるため、本発明の高分子に含まれるモノヒドロキシ化合物の濃度の上限は、通常0.3重量%、好ましくは0.2重量%、特に好ましくは0.15重量%である。下限については、上記問題を解決するために少ない方がよいが、溶融重合法では高分子中に残存するモノヒドロキシ化合物をゼロにすることは困難であること、除去のためには過大な労力が必要であることから、通常0.001重量%、好ましくは0.005重量%、更に好ましくは0.01重量%である。モノヒドロキシ化合物の含有量は、本発明の高分子を溶媒に溶かし、高速液体クロマトグラフィー等の公知の方法で定量することができる。
本発明の高分子には、フィルム成形性や延伸性、柔軟性付与のために1種以上の高分子をブレンドすることができる。ブレンドする高分子としては、エチレン、プロピレン等のα-オレフィン、ブタジエン、イソプレン、またはこれらの水素添加物から構成される脂肪族炭化水素構造からなる高分子、スチレン、α-メチルスチレン等、芳香族炭化水素構造からなる高分子、アクリロニトリル、アクリル酸、アクリル酸エステル、メタクリル酸、メタクリル酸エステル等、アクリル化合物から構成される高分子、またはAS樹脂、ABS樹脂、SEBS樹脂等に代表されるこれらの共重合体、ポリカーボネート樹脂、ポリエステルカーボネート樹脂、ポリエステル樹脂、ポリアミド樹脂、ポリフェニレンエーテル樹脂、ポリイミド樹脂等が挙げられる。中でも、本発明の高分子のガラス転移温度が140℃以上の場合に、ガラス転移温度が100℃以下の高分子をブレンドすると、フィルム成形性や延伸性、柔軟性を改良しながら、フィルムの環境変化による位相差フィルムの光学的特性の変化を抑制する効果が大きい。特には、ポリスチレン樹脂、ポリカーボネート樹脂、ポリエステルカーボネート樹脂、ポリエステル樹脂が好ましく、ポリエステル樹脂の中でも、フィルム成形性や延伸性、柔軟性付与の効果の大きいポリエチレングリコールやポリプロピレングリコール、ポリテトラメチレングリコールを共重合したポリエステル樹脂が好ましい。
他の構造の高分子をブレンドする比率は特に制限はないが、添加量が多すぎると透明性や波長分散性等の本発明の高分子が有する光学的性能を毀損したり、環境変化により位相差フィルムの光学的特性が変化したりする可能性があるため、高分子の合計に対して10重量%以下が好ましく、5重量%以下が更に好ましく、3重量%以下が特に好ましい。
本発明においては、環境変化による位相差フィルムの光学的特性の変化を抑制するために、エポキシ化合物、イソシアネート化合物、カルボジイミド化合物等の反応性官能基を有する化合物を添加することも有効である。これらの化合物の添加量は多すぎると、ゲル化を招き位相差フィルムの欠陥の原因となったり、光学的特性の低下を招いたりするため、本発明の高分子に対する混合比率としては、本発明の高分子100重量部に対して0.01~5重量部であり、好ましくは0.05~4重量部、より好ましくは0.1~3重量部である。
本発明の高分子に上記反応性官能基を有する化合物を添加する方法としては、上記化合物成分を同時に、または任意の順序でタンブラー、V型ブレンダー、ナウターミキサー、バンバリーミキサー、混練ロール、押出機等の混合機により本発明の高分子と混合する方法が挙げられるが、中でも押出機、特には二軸押出機により混練することが、分散性向上の観点から好ましい。
本発明で用いるカルボジイミド化合物(以下「本発明のカルボジイミド化合物」と称す場合がある。)は、分子中に1個以上のカルボジイミド基を有するカルボジイミド化合物(ポリカルボジイミド化合物を含む)であることが好ましく、一般的に良く知られた方法で合成されたものを使用することができる。例えば、触媒として有機リン系化合物又は有機金属化合物を用い、各種ポリイソシアネートを約70℃以上の温度で、無溶媒又は不活性溶媒中で、脱炭酸縮合反応に付することにより合成したものを用いることができる。
これらは、これらは1種を単独で用いてもよく、2種以上を併用してもよい。
本発明の高分子には、重合時や成形時等における分子量の低下や色相の悪化を防止するために熱安定剤を配合することができる。
本発明の樹脂組成物は、上記成分を同時に、または任意の順序でタンブラー、V型ブレンダー、ナウターミキサー、バンバリーミキサー、混練ロール、押出機等の混合機により混合して製造することができる。
以下に、本発明の高分子を用い、溶融製膜法により原反フィルムを得、これら延伸処理する際の処理条件を調整することにより、本発明の位相差フィルムを作製する方法について説明する。
ここで、原反フィルムの成形温度とは、溶融製膜法における成形時の温度であって、通常、溶融樹脂を押出すダイス出口の温度を測定した値である。
その延伸の方法は、自由端延伸、固定端延伸、自由端収縮、固定端収縮等、様々な延伸方法を、単独で用いることも、同時もしくは逐次で用いることもできる。
また、延伸方向に関しても、水平方向・垂直方向・厚さ方向、対角方向等、様々な方向や次元に行なうことが可能であり、特に限定されない。
好ましくは、横一軸延伸方法、縦横同時二軸延伸方法、縦横逐次二軸延伸方法等が挙げられる。
歪み速度(%/分)
={延伸速度(mm/分)/原反フィルムの長さ(mm)}×100
熱固定処理の温度としては、原反フィルム(即ち、原反フィルムの製膜材料である高分子又は樹脂組成物)のガラス転移温度(Tg)に対し、60℃~Tg、好ましくは70℃~Tg-5℃の範囲で行う。熱処理温度が高すぎると、延伸により得られた分子の配向が乱れ、所望の位相差から大きく低下してしまう可能性がある。
また、緩和工程を設ける場合は、延伸によって広がったフィルムの幅に対して、95%~100%に収縮させることで、延伸フィルムに生じた応力を取り除くことができる。この際にフィルムにかける処理温度は、熱固定処理温度と同様である。
上記のような熱固定処理や緩和工程を行うことで、高温条件下での長期使用による光学的特性の変動を抑制することができる。
位相差フィルムには、高分子の製造法や原反フィルムの製造法により塩素が含まれることがある。特に高分子の製造法として界面法を採用したり、原反フィルムの製造法として流延法を採用したりすると、塩化メチレンやクロロベンゼン等が残存溶媒の形態で高分子に、ひいては位相差フィルムに含まれる可能性があるが、含塩素溶媒が含まれていると、原反製膜や延伸操作の際に揮発する含塩素成分により、製膜装置や延伸装置の腐食や破損を招いたり、位相差板として組み立てた後に他の部材に悪影響を与えたりする場合がある。さらに位相差フィルム中の残存溶媒は可塑剤的に働くため、温度や湿度等の外部環境変化によって、光学的特性の変化を招く場合があるため、本発明の位相差フィルム中に含まれる塩素成分は、好ましくは塩素原子の重量として50ppm以下、より好ましくは20ppm以下、更に好ましくは10ppm以下、特には5ppm以下であることが好適である。
含塩素溶媒とは、分子構造中に塩素を含む有機溶媒であり、例えば、塩化メチレン、クロロホルム、四塩化炭素、1,1-ジクロロエタン、1,2-ジクロロエタン、1,1,1-トリクロロエタン、1,1,2-トリクロロエタン、1,1,2,2-テトラクロロエタン、クロロベンゼン、ジクロロベンゼン等の塩素置換炭化水素化合物が挙げられる。 含塩素溶媒は大半が法規制の対象であることから、本発明の位相差フィルム中の含有量は少ない方が好ましいが、通常50重量ppm以下、より好ましくは20重量ppm以下、更に好ましくは10重量ppm以下、特に好ましくは5ppm重量以下、好適には1重量ppm以下である。
残存溶媒を低減する方法としては、高分子の製造法として溶融重合法を採用することの他、得られた高分子を、押出機を用いて脱揮する方法、得られた高分子を減圧または熱風、熱窒素等で乾燥する方法、原反製膜に使用する押出機で脱揮しつつ製膜する方法等が挙げられる。
他方、本発明の高分子を溶融重合法で製造すると、副生するフェノール等のモノヒドロキシ化合物が位相差フィルム中に含まれることがあるが、モノヒドロキシ化合物も上記塩素系溶媒と同様、可塑剤的に働くため、温度や湿度等の外部環境変化によって、光学的特性の変化を招く場合がある。従って、本発明の位相差フィルムに含まれるモノヒドロキシ化合物の濃度の上限は、通常3000重量ppm、好ましくは2000重量ppm、更に好ましくは1500重量ppm、特に好ましくは1000重量ppmである。下限については、上記問題を解決するために少ない方がよいが、溶融重合法で得られた高分子に残存するモノヒドロキシ化合物をゼロにすることは困難であること、除去のためには過大な労力が必要であることから、通常1重量ppm、好ましくは10重量ppm、更に好ましくは100重量ppmである。
また、本発明においては、分子の動きを抑制し、高温条件下での長期使用による光学的特性の変動を抑制するために、原反フィルム製膜後または延伸した位相差フィルムに、電子線等の高エネルギー線照射をして分子内に架橋構造を構成することができる。
この時、予め本発明の高分子に、架橋構造を構成しやすいようにジビニルベンゼンやアリル(メタ)アクリレート等の二重結合を有する化合物もしくはそれらの重合体を配合することができ、中でもトリアリルイソシアヌレート、ジアリルモノグリシジルイソシアヌル酸等の二重結合基を分子内に2個以上有する化合物を配合することもでき、このような化合物を含むことにより、熱や電子線等の高エネルギー線照射により分子内に架橋構造を構成し、分子の動きを抑制することが容易になる。
本発明の円偏光板は、本発明の位相差フィルムを偏光板に積層してなるものである。
上記の偏光板としては、公知の様々な構成のものを採用することができる。例えば、従来公知の方法により、各種フィルムに、ヨウ素や二色性染料等の二色性物質を吸着させて染色し、架橋、延伸、乾燥することによって調製したもの等が使用できる。
以下において、ポリカーボネート樹脂、ポリカーボネート樹脂組成物及び原反フィルム、位相差フィルムの特性評価は次の方法により行った。なお、特性評価手法は以下の方法に限定されるものではなく、当業者が適宜選択することができる。
(1)光弾性係数
<サンプル作製>
80℃で5時間真空乾燥をしたポリカーボネート樹脂サンプル4.0gを、幅8cm、長さ8cm、厚さ0.5mmのスペーサーを用いて、熱プレスにて熱プレス温度200~250℃で、予熱1~3分、圧力20MPaの条件で1分間加圧後、スペーサーごと取り出し、水管冷却式プレスにて圧力20MPaで3分間加圧冷却してシートを作製した。このシートから幅5mm、長さ20mmにサンプルを切り出した。
<測定>
He-Neレーザー、偏光子、補償板、検光子、及び光検出器からなる複屈折測定装置と振動型粘弾性測定装置(レオロジー社製「DVE-3」)を組み合わせた装置を用いて測定した。(詳細は、日本レオロジー学会誌Vol.19,p93-97(1991)を参照。)
切り出したサンプルを粘弾性測定装置に固定し、25℃の室温で貯蔵弾性率E’を周波数96Hzにて測定した。同時に、出射されたレーザー光を偏光子、試料、補償板、検光子の順に通し、光検出器(フォトダイオード)で拾い、ロックインアンプを通して角周波数ω又は2ωの波形について、その振幅とひずみに対する位相差を求め、ひずみ光学係数O’を求めた。このとき、偏光子と検光子の方向は直交し、またそれぞれ、試料の伸長方向に対してπ/4の角度をなすように調整した。
光弾性係数Cは、貯蔵弾性率E’とひずみ光学係数O’を用いて次式より求めた。
C=O’/E’
ポリカーボネート樹脂の還元粘度は森友理化工業社製ウベローデ型粘度管を用いて、溶媒として、塩化メチレンを用い、温度20.0℃±0.1℃で測定した。濃度は0.6g/dLになるように、精密に調整した。
溶媒の通過時間t0、溶液の通過時間tから、下記式:
ηrel=t/t0
より相対粘度ηrelを求め、
相対粘度ηrelから、下記式:
ηsp=(η-η0)/η0=ηrel-1
より比粘度ηspを求めた。
比粘度ηspを濃度c(g/dL)で割って、下記式:
ηred=ηsp/c
より還元粘度(換算粘度)ηredを求めた。
この数値が高いほど分子量が大きい。
高分子のガラス転移温度は、示差走査熱量計(エスアイアイ・ナノテクノロジー社製、DSC220)を用いて、位相差フィルム約10mgを10℃/minの昇温速度で加熱して測定し、JIS-K7121(1987)に準拠して、低温側のベースラインを高温側に延長した直線と、ガラス転移の階段状変化部分の曲線の勾配が最大になるような点で引いた接線との交点の温度である、補外ガラス転移開始温度を求め、それをガラス転移温度とした。
高分子中の各ジヒドロキシ化合物に由来する構造単位比は、高分子30mgを秤取し、重クロロホルム約0.7mLに溶解し、溶液とし、これを内径5mmのNMR用チューブに入れ、日本電子社製JNM-AL400(共鳴周波数400MHz)を用いて常温で1H-NMRスペクトルを測定し、各成分に由来する構造単位に基づくシグナル強度比より求めた。
高分子試料を石英ボートに秤量し、全有機ハロゲン測定装置TOX-100(三菱化学アナリテック社製)で測定した。この測定値を位相差フィルムの塩素含有量とした。
高分子試料約10gを精秤して、加熱炉に入れて350℃に加熱し、加熱炉内に窒素ガスを40mL/minの流量で流した。加熱により発生したガスを窒素ガスに同伴させて、20mLのジオキサンを入れた吸収管に導いた。吸収管は13℃に冷却した。120分間、窒素ガスを流通させた後、吸収液をガスクロマトグラフィーで分析し、塩化メチレンの含有量を測定した。この測定値を位相差フィルムの塩化メチレン含有量とした。
高分子試料約1gを精秤し、塩化メチレン5mLに溶解して溶液とした後、総量が25mLになるようにアセトンを添加して再沈殿処理を行った。該溶液を0.2μmディスクフィルターでろ過して、液体クロマトグラフィーにて定量を行った。この測定値を位相差フィルムのフェノール含有量とした。
(1)フィルム厚み、厚み斑
尾崎製作所(株)製 製品名「PEACOCK」の接触式厚み測定機を使用して測定した。
溶融製膜性を評価するために、ポリカーボネート樹脂又はポリカーボネート樹脂組成物の溶融製膜時において以下の観察、評価を行った。
○:目視により、フィルム中の異物、気泡の有無を観察した際に欠陥が無いもの。
×:目視により、フィルム中の異物、気泡の有無を観察した際に欠陥があるもの。
ポリカーボネート樹脂又はポリカーボネート樹脂組成物の溶融製膜、一軸延伸を行って得られたフィルムを幅4cm、長さ4cmに切り出したサンプルについて、[Axometrics社製 製品名「AxoScan」]を用いて、23℃の室内で、波長450nmの位相差R(450)及び550nmの位相差R(550)及び波長650nmの位相差R(650)を測定した。そしてそれぞれ位相差R(450)と位相差R(550)の比、位相差R(650)と位相差R(550)の比を計算した。
位相差は、延伸工程後の位相差フィルムについて、位相差R1(450)、位相差R1(550)及び位相差R1(650)を測定すると共に、位相差フィルムを90℃で48時間保持した後の位相差R2(450)、位相差R2(550)及び位相差R2(650)を測定した。
また、前記位相差R1(550)を、前記一軸延伸を行って得られたフィルムの厚み(t)で除し、下記式に従い、波長550nmでの複屈折を求めた。
複屈折(Δn1)=R1(550)/t
実施例及び比較例において得られた位相差フィルムの各々と偏光板(日東電工社製 商品名NPF TEG1465DUHC、粘着剤層を除いた厚み112μm)とを位相差フィルムの遅相軸と偏光子の吸収軸が45℃となるように、アクリル系粘着剤(20μm)を介して貼り合せることにより円偏光板を作製した。この円偏光板を同アクリル系粘着剤(厚み20μm)を介して有機ELパネル(LGディスプレイ社製 商品名15EL9500)の視認側に貼り合せて表示パネル装置を作成した。尚、評価に用いた有機ELパネルは、表面に貼り合わされてある反射防止フィルムを予め剥離してから使用した。評価方法は下記に示すように行った。
作製したパネルを、90℃の恒温オーブン中に48時間保管(加熱試験)した後、目視にてムラについて確認を行った。
○:目視観察にて画面上にムラが確認できず、シャープな黒色が得られた。
△:目視観察にて画面上にムラは確認できなかったが、黒色鮮鋭性が低下していた。
▲:目視観察にて画面の黒色鮮鋭性は低下していなかったが、ムラが確認された。
×:目視観察にて画面上にムラが確認された。
前述した高分子のガラス転移温度と同じ方法で、原反フィルムおよび位相差フィルムのガラス転移温度を測定した。
・ISB:イソソルビド[ロケットフルーレ社製、商品名:POLYSORB]
・BHEPF:9,9-ビス[4-(2-ヒドロキシエトキシ)フェニル]フルオレン[大阪ガスケミカル(株)製]
・PEG#1000:ポリエチレングリコール 数平均分子量1000 [三洋化成工業(株)製]
・PEG#2000:ポリエチレングリコール 数平均分子量2000 [三洋化成工業(株)製]
・DEG:ジエチレングリコール[三菱化学(株)製]
・CHDM:1,4-シクロヘキサンジメタノール[新日本理化(株)製、商品名:SKY CHDM]
・SPG:スピログリコール[三菱ガス化学(株)製]
・DPC:ジフェニルカーボネート[三菱化学(株)製]
イソソルビド(以下、「ISB」と略記することがある。)を445.1重量部、9,9-(4-(2-ヒドロキシエトキシ)フェニル)フルオレン(以下、「BHEPF」と略記することがある。)を906.2重量部、分子量1000のポリエチレングリコール(以下、「PEG#1000」と略記することがある。)15.4重量部、ジフェニルカーボネート(以下、「DPC」と略記することがある。)を1120.4重量部、及び触媒として炭酸セシウム(0.2重量%水溶液)6.27重量部を、それぞれ反応器に投入し、窒素雰囲気下にて、反応の第1段目の工程として、反応容器の熱媒温度を150℃にし、必要に応じて攪拌しながら、原料を溶解させた(約15分)。次いで、反応容器内の圧力を常圧から13.3kPaにし、反応容器の熱媒温度を190℃まで1時間で上昇させながら、発生するフェノールを反応容器外へ抜き出した。
合成例1においてISBを489.7重量部、BHEPFを856重量部、PEG#1000を16重量部、DPCを1162.2重量部、触媒として炭酸セシウム水溶液を6.5重量部とした以外は、合成例1と同様に実施し、BHEPF/ISB/PEG#1000=36.7モル%/63.0モル%/0.3モル%のポリカーボネート樹脂Bを得た。
合成例1においてISBを432重量部、BHEPFを906.3重量部、PEG#1000を30.3重量部、DPCを1104.1重量部、触媒として炭酸セシウム水溶液を6.2重量部とした以外は、合成例1と同様に実施し、BHEPF/ISB/PEG#1000=40.9モル%/58.5モル%/0.6モル%のポリカーボネート樹脂Cを得た。
合成例1においてISBを444.7重量部、BHEPFを906.8重量部、PEG#2000を15.4重量部、DPCを1118.5重量部、触媒として炭酸セシウム水溶液を6.3重量部とした以外は、合成例1と同様に実施し、BHEPF/ISB/PEG#2000=40.4モル%/59.45モル%/0.15モル%のポリカーボネート樹脂Dを得た。
合成例1においてISBを432.4重量部、BHEPFを906.3重量部、PEG#2000を30.2重量部、DPCを1101.4重量部、触媒として炭酸セシウム水溶液を6.2重量部とした以外は、合成例1と同様に実施し、BHEPF/ISB/PEG#2000=41.0モル%/58.7モル%/0.3モル%のポリカーボネート樹脂Eを得た。
合成例1においてISBを433.4重量部、BHEPFを934.1重量部、DPCを1113.5重量部、触媒として炭酸セシウム水溶液を6.2重量部とした以外は、合成例1と同様に実施し、BHEPF/ISB=41.8モル%/58.2モル%のポリカーボネート樹脂Fを得た。このポリカーボネート樹脂は溶融粘度が高く、溶融濾過により樹脂中の異物などを除去するのに長時間を要し、困難であった。
合成例1においてISBを357.2重量部、BHEPFを896.8重量部、ジエチレングリコール(以下、「DEG」と略記することがある。)を103.9重量部、DPCを1194.8重量部、触媒として炭酸セシウム水溶液を6.7重量部とした以外は、合成例1と同様に実施し、BHEPF/ISB/DEG=37.4モル%/44.7モル%/17.9モル%のポリカーボネート樹脂Gを得た。
合成例1においてISBを390.9重量部、BHEPFを920.5重量部、PEG#1000を62.9重量部、DPCを1056.8重量部、触媒として炭酸セシウム水溶液を5.9重量部とした以外は、合成例1と同様に実施し、BHEPF/ISB/PEG#1000=43.4モル%/55.3モル%/1.3モル%のポリカーボネート樹脂Hを得た。
ISBを397.3重量部、BHEPFを960.1重量部、PEG#1000を14.6重量部、DPCを1065.1重量部、触媒として酢酸マグネシウム4水和物を8.45×10-3重量部を、それぞれ反応器に投入し、窒素雰囲気下にて、反応の第1段目の工程として、反応容器の熱媒温度を150℃にし、必要に応じて攪拌しながら、原料を溶解させた(約15分)。次いで、反応器内温を220℃まで上昇させ、220℃に到達と同時に圧力を常圧から13.3kPaに90分間かけて減圧した。この間、内温は220℃に保持した。発生するフェノールを反応容器外へ抜き出した。第2段目の工程として、13.3kPaに到達した後、内温を15分かけて240℃まで上昇させた。この間、圧力は13.3kPaに保持した。内温が240℃に到達した後、15分間かけて圧力を13.3kPaから200Pa以下に減圧した。所定の攪拌トルクに到達後、反応を終了し、生成した反応物を水中に押し出した後に、ペレット化を行い、BHEPF/ISB/PEG#1000=44.5モル%/55.2モル%/0.3モル%のポリカーボネート樹脂Iを得た。
ISBを267.4重量部、BHEPFを571.1重量部、DEGを64.3重量部、DPCを808.7重量部、触媒として酢酸マグネシウム4水和物を8.02×10-3重量部とした以外は合成例9と同様に行い、BHEPF/ISB/DEG=34.8モル%/49.0モル%/16.2モル%のポリカーボネート樹脂Jを得た。
ISBを288.1重量部、BHEPFを604.2重量部、CHDMを17.5重量部、DPCを750.9重量部、触媒として酢酸マグネシウム4水和物を2.23×10-2重量部とした以外は合成例9と同様に行い、BHEPF/ISB/CHDM=39.7モル%/56.8モル%/3.5モル%のポリカーボネート樹脂Kを得た。
BHEPFを505.0重量部、SPGを428.4重量部、DPCを559.2重量部、酢酸カルシウム1水和物を9.02×10-2重量部をそれぞれ反応器に投入し、十分に窒素置換した(酸素濃度0.0005~0.001vol%)。続いて熱媒で加温を行い、内温が100℃になった時点で撹拌を開始した。昇温を開始後40分で内温を220℃にし、内温が220℃に到達した時点でこの温度を保持するように制御すると同時に、減圧を開始し、220℃に到達してから90分で13.3kPa(絶対圧力、以下同様)にして、この圧力を保持するようにしながら、さらに30分間保持した。重合反応とともに副生するフェノール蒸気は、100℃の還流冷却器に導き、フェノール蒸気中に若干量含まれるモノマー成分を重合反応器に戻し、凝縮しないフェノール蒸気は続いて45℃の凝縮器に導いて回収した。
このようにしてオリゴマー化させた内容物を、一旦大気圧にまで復圧させた後、撹拌翼および100℃に制御された還流冷却器を具備した別の重合反応装置に移し、昇温および減圧を開始して、50分で内温260℃、圧力200Paにした。その後、20分かけて圧力133Pa以下にして、所定撹拌動力になった時点で復圧し、内容物(ポリカーボネート樹脂L)をストランドの形態で抜出そうとしたところ、ゲル化が起こり、内容物が一部しか抜き出せなかった。
合成例1で得たポリカーボネート樹脂Aを80℃で5時間真空乾燥した後、単軸押出機(いすず化工機社製、スクリュー径25mm、シリンダー設定温度:220℃)、Tダイ(幅200mm、設定温度:220℃)、チルロール(設定温度:120~130℃)及び巻取機を備えたフィルム製膜装置を用いて、厚み100μmの原反フィルムを作製した。この原反フィルムから幅6cm、長さ6cmの試料を切り出し、厚み斑を測定した。この試料を、バッチ式二軸延伸装置(東洋精機社製)で、延伸温度を127~177℃で調節しながらR1(550)が130±20nmとなるように、延伸速度720mm/分(ひずみ速度1200%/分)で、1×2.0倍の一軸延伸を行い、位相差フィルムを得た。このとき延伸方向に対して垂直方向は、保持した状態(延伸倍率1.0)で延伸を行った。
得られた位相差フィルムについて評価を行い、結果を表2に示した。
合成例2で得たポリカーボネート樹脂Bを用いた以外は、実施例1と同様に行い、位相差フィルムを得た。
得られた位相差フィルムについて評価を行い、結果を表2に示した。
合成例3で得たポリカーボネート樹脂Cを用いた以外は、実施例1と同様に行い、位相差フィルムを得た。
得られた位相差フィルムについて評価を行い、結果を表2に示した。
合成例4で得たポリカーボネート樹脂Dを用いた以外は、実施例1と同様に行い、位相差フィルムを得た。
得られた位相差フィルムについて評価を行い、結果を表2に示した。
合成例5で得たポリカーボネート樹脂Eを用いた以外は、実施例1と同様に行い、位相差フィルムを得た。
得られた位相差フィルムについて評価を行い、結果を表2に示した。
合成例7で得たポリカーボネート樹脂Gを99.5重量部に、カルボジイミド化合物(日清紡績社製、商品名:カルボジライトLA-1)0.5重量部を日本製鋼社製2軸押出機(TEX30HSS-32)を用いて、樹脂温度230℃で押出し、水で冷却固化させた後、回転式カッターでペレット化した。
得られたペレットを実施例1と同様に乾燥した後、同様の方法で製膜、延伸を行い、位相差フィルムを得た。
得られた位相差フィルムについて評価を行い、結果を表2に示した。
合成例6で得たポリカーボネート樹脂Fを用いた以外は、実施例1と同様に行い、位相差フィルムを得た。
得られた位相差フィルムについて評価を行い、結果を表2に示した。
合成例9で得たポリカーボネート樹脂Iを80℃で5時間真空乾燥した後、単軸押出機(いすず化工機社製、スクリュー径25mm、シリンダー設定温度:220℃)、Tダイ(幅200mm、設定温度:220℃)、チルロール(設定温度:120~130℃)及び巻取機を備えたフィルム製膜装置を用いて、厚み95μmの原反フィルムを作製した。この原反フィルムから幅12cm、長さ12cmの試料を切り出し、厚み斑を測定した。この試料を100℃で3日間真空乾燥させ、原反フィルム中に含まれるフェノール等の揮発成分を除いた。このように処理した試料を、バッチ式二軸延伸装置(ブルックナー社製)で、延伸温度を127~177℃で調節しながらR1(550)が130±20nmとなるように、延伸速度360mm/分(ひずみ速度300%/分)で、1×2.0倍の一軸延伸を行い、位相差フィルムを得た。このとき延伸方向に対して垂直方向は、保持せずに延伸を行った。
得られた位相差フィルムについて評価を行い、結果を表2に示した。
合成例9で得たポリカーボネート樹脂I99重量部に、ポリスチレン樹脂(PSジャパン社製、商品名:G9504)1重量部を、ベント口を2つ有する日本製鋼社製2軸押出機(TEX30HSS-32)を用いて、ベント口から真空ポンプを用いて脱揮しながら、樹脂温度230℃で押出し、水で冷却固化させた後、回転式カッターでペレット化した。
得られたペレットを実施例8と同様に乾燥した後、同様の方法で製膜し、真空処理によるフェノール等の除去、延伸を行い、位相差フィルムを得た。得られた位相差フィルムについて評価を行い、結果を表2に示した。
合成例9で得たポリカーボネート樹脂I99重量部に、ビスフェノールAをジヒドロキシ化合物成分とするポリカーボネート(三菱化学社製、商品名:ノバレックス7022J)1重量部を、ベント口を2つ有する日本製鋼社製2軸押出機(TEX30HSS-32)を用いて、ベント口から真空ポンプを用いて脱揮しながら、樹脂温度230℃で押出し、水で冷却固化させた後、回転式カッターでペレット化した。
得られたペレットを実施例8と同様に乾燥した後、同様の方法で製膜し、真空処理によるフェノール等の除去、延伸を行い、位相差フィルムを得た。得られた位相差フィルムについて評価を行い、結果を表2に示した。
合成例9で得たポリカーボネート樹脂I99重量部に、1,4-ブタンジオール、テレフタル酸、ポリテトラメチレングリコールを構成成分とするポリエステル系エラストマー(三菱化学(株)社製、商品名:プリマロイCP300H)1重量部を、ベント口を2つ有する日本製鋼社製2軸押出機(TEX30HSS-32)を用いて、ベント口から真空ポンプを用いて脱揮しながら、樹脂温度230℃で押出し、水で冷却固化させた後、回転式カッターでペレット化した。
得られたペレットを実施例8と同様に乾燥した後、同様の方法で製膜し、真空処理によるフェノール等の除去、延伸を行い、位相差フィルムを得た。得られた位相差フィルムについて評価を行い、結果を表3に示した。
合成例9で得たポリカーボネート樹脂Iを99重量部に、ポリエステル系エラストマー(EASTMAN Chemical社製、商品名:ECDEL9966)1重量部を、ベント口を2つ有する日本製鋼社製2軸押出機(TEX30HSS-32)を用いて、ベント口から真空ポンプを用いて脱揮しながら、樹脂温度230℃で押出し、水で冷却固化させた後、回転式カッターでペレット化した。
得られたペレットを実施例8と同様に乾燥した後、同様の方法で製膜し、真空処理によるフェノール等の除去、延伸を行い、位相差フィルムを得た。得られた位相差フィルムについて評価を行い、結果を表3に示した。
ポリカーボネート樹脂Iの代りに、合成例10で得たポリカーボネート樹脂Jを用いて、厚み103μmの押出フィルムを得た以外は、実施例8と同様に行い、位相差フィルムを得た。得られた位相差フィルムについて評価を行い、結果を表3に示した。
ポリカーボネート樹脂Iの代りに、合成例11で得たポリカーボネート樹脂Kを用いた以外は、実施例8と同様に行い、位相差フィルムを得た。得られた位相差フィルムについて評価を行い、結果を表3に示した。
合成例10で得たポリカーボネート樹脂Jを用い、原反フィルムの真空処理によるフェノール除去を行わなかった以外は、実施例14と同様に行い、位相差フィルムを得た。得られた位相差フィルムについて評価を行い、結果を表3に示した。
合成例8で得たポリカーボネート樹脂Hを用い、厚み92μmの原反フィルムを得た以外は、実施例8と同様に行い、位相差フィルムを得た。得られた位相差フィルムについて、熱処理温度100℃、熱処理時間1分間の熱処理を行った。得られた熱処理後の位相差フィルムについて評価を行い、結果を表3に示した。
ポリカーボネート樹脂Aの代りに、合成例7で得たポリカーボネート樹脂Gを用いた以外は、実施例1と同様に行い、位相差フィルムを得た。
得られた位相差フィルムについて評価を行い、結果を表3に示した。
ポリカーボネート樹脂Aの代りに、合成例8で得たポリカーボネート樹脂Hを用いた以外は、実施例1と同様に行い、位相差フィルムを得た。
得られた位相差フィルムについて評価を行い、結果を表3に示した。
合成例10で得たポリカーボネート樹脂Jを塩化メチレンに溶解させ、15重量%溶液を作製した。ステンレス製の板の上に、マイクロメーター付フィルムアプリケーター(テスター産業社製 SA-204)を用いて、製膜した。ステンレス板ごと熱風乾燥器に入れて、40℃で10分間、その後80℃で20分間乾燥した。ステンレス製板よりフィルムを剥がし、キャストフィルムを得た。
このキャストフィルムをバッチ式二軸延伸装置(ブルックナー社製)で、延伸温度を127~177℃で調節しながらR1(550)が130±20nmとなるように、延伸速度360mm/分(ひずみ速度300%/分)で、1×2.0倍の一軸延伸を行い、位相差フィルムを得た。このとき延伸方向に対して垂直方向は、保持せずに延伸を行った。
得られた位相差フィルムについて評価を行い、結果を表3に示した。
このものは残存塩化メチレンとフェノールが多く、熱処理後の波長分散性の変化が大きく、ムラや黒色先鋭性の低下が見られた。
Claims (13)
- 下記式(A)及び(B)の関係を満たす位相差フィルム。
式(A):0.7<R1(450)/R1(550)<1
式(B):|R2(450)/R2(550)-R1(450)/R1(550)|<0.020
(ただし、上記R1(450)及びR1(550)はそれぞれ波長450nm及び550nmにおけるフィルム面内の位相差値を表し、上記R2(450)及びR2(550)はそれぞれ温度90℃において48時間放置した後の波長450nm及び550nmにおけるフィルム面内の位相差値を表す。) - 下記式(C)及び(D)の関係を満たす請求項1に記載の位相差フィルム。
式(C):1<R1(650)/R1(550)<1.2
式(D):|R2(650)/R2(550)-R1(650)/R1(550)|<0.010
(ただし、上記R1(650)は波長650nmにおけるフィルム面内の位相差値を表し、前記R2(650)は温度90℃において48時間放置した後の波長650nmにおけるフィルム面内の位相差値を表す。) - 吸収端が260nm未満である正の屈折率異方性を有する構造単位(a)と、吸収端が260~380nmである負の屈折率異方性を有する構造単位(b)とを含む高分子を形成して得られる位相差フィルムである請求項1又は請求項2に記載の位相差フィルム。
- 前記高分子がポリカーボネート樹脂及び/又はポリエステルカーボネート樹脂である請求項3に記載の位相差フィルム。
- 前記高分子がポリカーボネート樹脂であって、
前記構造単位(b)が、下記式(1)で表されるジヒドロキシ化合物に由来する構造単位であり、
前記構造単位(a)が、下記式(2)で表されるジヒドロキシ化合物に由来する構造単位、下記式(3)で表されるジヒドロキシ化合物、下記式(4)で表されるジヒドロキシ化合物、下記式(5)で表されるジヒドロキシ化合物及び下記式(6)で表されるジヒドロキシ化合物からなる群より選ばれた一種以上のジヒドロキシ化合物に由来する構造単位である請求項4に記載の位相差フィルム。
(上記式(3)中、R5は置換若しくは無置換の炭素数4~炭素数20のシクロアルキレン基を表す。)
HO-CH2-R6-CH2-OH (4)
(上記式(4)中、R6は置換若しくは無置換の炭素数4~炭素数20のシクロアルキレン基を表す。)
H-(O-R7)p-OH (5)
(上記式(5)中、R7は置換若しくは無置換の炭素数2~炭素数10のアルキレン基を表し、pは2~50の整数である。)
HO-R8-OH (6)
(上記式(6)中、R8は置換若しくは無置換の炭素数2~炭素数20のアルキレン基、又は下記式(6A)に示す基を表す。)
- 前記高分子において、アセタール構造を有するジヒドロキシ化合物に由来する構造単位が、全ジヒドロキシ化合物に由来する構造単位に対して10mol%以下である請求項5に記載の位相差フィルム。
- 前記構造単位(b)が、前記式(1)で表されるジヒドロキシ化合物に由来する構造単位であり、
前記構造単位(a)が、前記式(2)で表されるジヒドロキシ化合物に由来する構造単位と、前記式(5)で表されるジヒドロキシ化合物に由来する構造単位である請求項5または請求項6に記載の位相差フィルム。 - 単層のフィルムである請求項1から請求項7のいずれか1項に記載の位相差フィルム。
- 前記高分子の光弾性係数が45×10-12Pa-1以下である請求項3から請求項8のいずれか1項に記載の位相差フィルム。
- ガラス転移温度が110℃以上150℃以下である請求項1から請求項9のいずれか1項に記載の位相差フィルム。
- 請求項1から請求項10のいずれか1項に記載の位相差フィルムと偏光板とが積層されて構成される円偏光板。
- 請求項11に記載の円偏光板を有する画像表示装置。
- 前記画像表示装置が、有機ELを用いたものである請求項12に記載の画像表示装置。
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- 2012-08-01 JP JP2012171499A patent/JP2013076982A/ja active Pending
- 2012-09-13 EP EP12832087.6A patent/EP2757394B1/en active Active
- 2012-09-13 CN CN201280055691.4A patent/CN104067151B/zh active Active
- 2012-09-13 KR KR1020147009912A patent/KR20140069158A/ko not_active Application Discontinuation
- 2012-09-13 WO PCT/JP2012/073528 patent/WO2013039179A1/ja active Application Filing
- 2012-09-14 TW TW101133659A patent/TWI538932B/zh active
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2014
- 2014-03-14 US US14/211,897 patent/US20140268333A1/en not_active Abandoned
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2016
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013128954A1 (ja) * | 2012-02-27 | 2013-09-06 | 日東電工株式会社 | 位相差フィルム及びその製造方法、偏光板、及び表示装置 |
US9389352B2 (en) | 2012-02-27 | 2016-07-12 | Nitto Denko Corportation | Retardation film and production method therefor, polarizing plate, and display device |
JP2017149922A (ja) * | 2016-02-19 | 2017-08-31 | 宇部興産株式会社 | ポリカーボネートポリオール |
Also Published As
Publication number | Publication date |
---|---|
EP2757394B1 (en) | 2017-05-10 |
US20160216408A1 (en) | 2016-07-28 |
JP2013076982A (ja) | 2013-04-25 |
CN104067151A (zh) | 2014-09-24 |
CN104067151B (zh) | 2016-06-29 |
KR20140069158A (ko) | 2014-06-09 |
TW201323481A (zh) | 2013-06-16 |
TWI538932B (zh) | 2016-06-21 |
EP2757394A1 (en) | 2014-07-23 |
US20140268333A1 (en) | 2014-09-18 |
EP2757394A4 (en) | 2015-07-15 |
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